Jurassic Park :: Essays Papers

Jurassic Park A very wealthy man has created a technique to clone dinosaurs. He is able to do so with the left behind DNA that his genius team of scientists and experts can extract. He is able to grow the dinosaurs in labs and lock them up on an island behind electric fences. He has created a sort of theme park on the island, which is located off the west coast of Costa Rica. The island is called Isle Nublar. He plans to have the entire planet come and visit his amazing prehistoric marvels. He asks a group of scientists from several different fields to come and view the park, but something goes terribly wrong when a worker on the island decides to be a traitor and shuts down the power. The main characters in the book are: John Hammond who is a billionaire developer who has used his resources to create the dinosaur filled island known as Jurassic Park. He is an old grandfather, and he dies in the book by a dinosaur known as a Procompsognathus. Dr. Alan Grant who is a famous paleontologist who agrees to visit Jurassic Park only to find out it is the home of several Dinosaurs. Unlike the movie Dr. Grant loves kids in the book. He also had a beard. Dr. Ellie Sattler is a Paleobotinist, who is also among the first people to tour Jurassic Park. There is also Tim, who is the 11-year-old grandson of John Hammond. He is kind of geeky, into computers and loves Dinosaurs. His 7-year-old sister is Alexis. She has a tomboy attitude and loves baseball. Ian Malcom is the Mathematician that uses "Chaos Theory" to predict disastrous results. He only wears black and gray. He is presumably dead in Jurassic Park the book, but somehow he shows up in the sequel, The Lost World. Finally there is Dennis Nedry. He was the computer genius who's greed and ambition bring chaos to Jurassic Park. There are many other characters that played a big part in the book, but I thought they were the best and the plot revolved around them. The characters show the greatest difference in the movie and the book. There were many opposites in the characters and even the roles and personalities of Tim and Lex were reversed. The book starts off when some of the dinosaurs have escaped form the island.

Family Assessment Essay

As a nurse practicing in today’s health care environment it is always important to be very attentive for the needs of the patient and the patient’s family. In order to realize the needs of the patient and the patients loved ones it is often helpful to conduct a family assessment. This assessment was carried out on an urban family which is in the middle income group. Some of the factors which were inferred from the assessment were as follows. In terms of values, health and nutrition, it was found that the members paid much emphasis to this. As s matter of fact, the initial family expenditure was on these three. Health is taken as a vital requirement and all the individuals need to have it. This is the same case with rest. Since most of the members are quite busy all through the day, the family spends some time together in the evening before retiring to bed. Most of the free time is spent having the family together in a relaxed atmosphere (Ritchie, 2012). The family is very concerned for the patient’s needs and overall well-being. They are so concerned about elimination, though the need for exercise and activity is highly acknowledged. The members appreciate and know the need for physical fitness. As such, they try to make sure that they attain it. Nevertheless, they have such tight schedules that they do not get enough time to be engaged in these. This is quite unfortunate. On the cognitive factors, the family is highly receptive. The level attained in the family is based on the importance it attaches to the cognitive development. The children have gone through learning institutions and are still in pursuit of knowledge and education. This is the same case with the parents. They work with the notion that information is power. As it pertains to health care sometimes simple common sense comes into play. Sensory perception is taken as a defining factor of the common sense. However, there is a saying that common sense is not common to all. Nevertheless, this family has greatly attained this sensory perception. Everyone is aware of their surroundings and they are willing to work towards making the family even better. Their self-esteem is also quiet high. Based on the findings from the interview, they have high regard of each other due to the accomplishments they have seen in their lives. Their high esteem is based on the fact that they do not compare themselves with others. Rather, they believe in who they are. This also helps to streamline their roles relationship since everyone understands his/her position in the family and does as is appropriate to their role (IFNA, 2012). Sexuality is a very touchy issue for many people but it is something that often needs to be addressed. The issue of sexuality is a major concern for many, since people tend to have different sexual orientations. This family remains open to the issue of sexuality and everyone has the freedom to choose or decide the path he wants to follow. However, this has to fall in line with the family values which they hold dearly. Lastly, there is the aspect of coping. This family, just like many others, encounters daily challenges. However, it has managed to come through all of them. The reason cited by the members is because they believe in the harmony and unity of a family. Therefore, the problem of one is a problem for all. The family works with the philosophy of one for all and all for one. This is what has made the family stand all along besides the challenges they face (Ritchie, 2012). As it pertains to diagnosis assessment can be very helpful. In diagnosing this family, there are two main nursing diagnoses that can be reached at. These are in line with the International Family Nursing Organization (2012). These two are emotional readiness as well as the status and function. These two seem to be very consistent in this family. They are as indicated in the paragraphs below. The emotional well-being of a person goes a long way in terms of having good physical health. On the emotional status, IFNA (2012) talks of the emotional readiness where the people are ready to change or take up traits that can help the family to function normally. The emotional status has it that a family is ready to take up the health options available. On this aspect, the family proved to be ready for the changes that would benefit it. Most of the members agreed that they were ready to adopt healthier practices that could improve their health. For instance, they acknowledged that they needed to be more vigilant in exercising and physical activity. This was a good status of mind. Sometimes if a person displays destructive behavior there needs to be a willingness to improve and change. Despite the willingness to change, a challenge that faces this family is the status and function. According to the IFNA (2012), this diagnoses has it that a family or individual should have the will to change. However, the circumstances are not favorable. This is the same case that applies with the family. All the members are ready and willing to change and adopt the healthy options. However, they do not have the time in which they can undertake these activities. All they have is the willingness to change but the factors around them do not allow them to. In conclusion, this essay has looked at the family health assessment. It has defined how a family diagnosis can be done and the factors affecting it. This has been followed up by a case study looking at a real family and performing a health analysis on it. From the discussion, it has come out quiet clearly that family assessment should be based on the health and functionality of the family as a unit. For this reason, the family health model comes in handy as an assessment method. This was as seen in the case study which reveals the need for a comprehensive family assessment. It leads to the realization of all factors affecting a family’s health and functionality; hence coming up with proper intervention strategies.

Cyber Terrorism

‘Terrorism’ is a tough terminology to define. Many schools of thought exist about it, who takes a look upon it with varying perceptions according to their ethnicity, education, cultural groom and personal preferences. Terrorism may take a form of religious duty at one place, a form of revenge at another, a tactical or strategic arm or threat, a justified form of resistance to oppression or a coercive power for armed forces; conclusively whatever shape it takes, it causes violence, may it be on human or nature.Moving along the revolutionary change brought about since the last century is mainly because of information. Robin Morgan, famous feminist activist, writer and poet, summed it up by saying â€Å"Information is power. The secreting or hoarding of knowledge or information may be an act of tyranny camouflaged as humility. † Unfortunately or not, this world is being completely obsessed in the husk called information warfare. It’s not the time anymore when military would be a sign of arrogance and symbol of pride and power of a nation; today military is the last resort to take over any territory.This new form of warfare is an offensive onslaught or a defensive mechanism, adopted in order to ‘deny’, ‘exploit’, ‘corrupt’ or ‘destroy’ rival’s information based systems, like computer networks and Information systems (Goldberg, Director IASIW). In simplest words, it’s a discipline that has originated a smarter way to tackle one’s adversary. Putting together the Information warfare with terrorism, the greatest fears of twentieth century are combined together as â€Å"Cyber terrorism† (Patrick, 2002) IMPORTANT CONCEPTSCyber Terrorism The phrase ‘Cyber Terrorism’ is one of the most ambiguously defined term, or should we say that information warfare has propagated the definition of Cyber-terrorism in order to limit or disrupt the main cause of Terroris m. Major discussion today is regarding the scope of cyber-terrorism, as it is overlapping with cyber-crime, cracking and terrorism (Baranetsky, 2009). Major discrimination between these crimes is on the basis of motivation, methods, targets and the involvement of computer system.Technically, cyber terrorism and information warfare are the same things, but there’s a practical difference. Cyber terrorism is originated by politically motivated groups, disrupted individuals, or cyber cracking facilitators against information, computer systems and networks, in order to target nonviolent portions in society; whereas, Information warfare is originated by national defences against information, computer systems and networks in order to aggravate the enemy losses (Colarik & Janczewski, 2005). Ideological ExtremismAnother profound and old notion of human history is extremism. It is usually associated with religion, ideological and political practices of people which are not in accordanc e with generally accepted norms of a religion, society or a political setup. It’s not something that could be easily defined in words, but when one sees it, it is recognized (Sotlar, 2004). Recently, the element of terrorism has taken its roots in those extremist people, and they have developed the ideology against forces, that are held together to fight the rising terrorism in the globe.Most known of these extremists are people of Al-Qaeda who, so called on the name of Islam, are spreading their ideological extremism, not only through militia warfare, but also electronic and information warfare. Cyber terrorism and Ideological Extremism Talking about the national security, the two major concerns of every nation today are terrorism and ideological extremism. Both are the sources of violence, may it be political or ethnical in nature (Gunaratna, 2008). Major source of both these concern today is Al-Qaeda.Originated by Osama Bin Laden, leader of Al-Qaeda, today they are the sou rce of terrorism all over the world. With recent transformation from an operational to ideological organization, today the pose the greatest threat not only to non-Muslims, but to Muslims and Islam as well. Now the idea behind this shift is to dismantle the social structures and religious beliefs into ideological extremism such that people of Asia, Africa and Middle East stand and operate for them on the front line. In simple words, they’re brain-washing and making terrorists.STATEMENT OF PROBLEM Recent developments from this â€Å"Jihadi† movement have come in the form of extremist articles on the websites. Through various websites, they are prompting targeted people into expressing their views about articulated beliefs that are designed to brain-wash the mind of those people. Other recent propaganda of extremist views encompasses political repression, racism, ethnical conspiracies, religious cults, Jihadists movements and religious fallacies. Certainly or not, is ide ological extremism open terrorism?Are these terrorists making use of internet to indulge people into morally, ethically and socially wrong activities that are endangering all their surroundings? Certainly we need to find how cyber terrorists are expanding their spectrum of operations and are including those vulnerable people as the match stick to next bomb to be exploded anywhere in the world. LITERATURE REVIEW As we stepped into the twentieth century, we were welcomed by some uprising, strong challenges that have so far consumed most portion of the world’s economy. Terrorism was one of them.With terrorism finding its roots in many different countries, terrorists have diversified their operational methodology. Now at the front end, they are fighting by using one of us. The new revolution of Ideological Extremism, especially in the name of Islam, is taking its roots into the youngsters. Not surprisingly, those terrorists have exploited the simple connection of whole world, int ernet. Apart from the major role of U. S led war on terrorism, two other important fundamentalists are United Kingdom and the Kingdom of Saudi Arabia. Anti-terrorism policy of Saudi Arabia is mostly termed as â€Å"soft counterterrorism†.But over the period of time, it has been proven successful (Hegghammer, 2010). They have reacted calmly to the situation, and by using their local preachers, they have successfully tackled those terrorist militants (Hegghammer, 2010) who were there with the intent of disrupt the government structure of Royal family, who had supported U. S. in its war against terrorism (Miller, 2003). They didn’t only counter those ideological extremists but also started a rehabilitation program in order to neutralize their extreme beliefs with reality and norms of Saudi culture (Boucek, 2008).They are also concerned about the uprising ideological extremism in the country (Saleh, 2006). They reinstated their solid stance against terrorism, and they with held their stance against any part involved in terrorism (Source: Arab News: 2010). U. S. , which was previously accusing Saudi Arabia to be an ally of Al-Qaeda (Sperry, 2002), commended the efforts of Saudi Arabia in controlling those terrorist activities, and rehabilitation of detained militants (Source: Saudi Embassy, 2009 – 2010).UK has well-defined laws for terrorism, and are actively involved in reviewing and improving them, as per the current terrorist threats (Source: Foreign and Commonwealth Office). Following the incident of 9/11, UK adopted policies to minimize the developing security threats from terrorists (Browning, 2005). They experienced their major setback in the month of July, 2005, when in London bombings, more than fifty travellers were killed, leaving 700 injured. To the surprise of British, the leader of those terrorist attacks was British born Muslim (Talbot, 2006).Since then, Islamism is considered a threat in UK, may it be in any of its form (Readings , 2010). The widespread of this ideological extremism is very much attributed to the up-rising cyber terrorism, and use of internet to propagate local people about their home countries, brainwashing them, and making them fight for terrorists (Gunaratna, 2008). RESEARCH IMPORTANCE Importance of internet today is more of a necessity than a luxury. It outweighs endless opportunities to all the people around the globe to retrieve or share anything they want to.Freedom of speech and lack of centrally aligned governing body has exposed the contents of internet to boundless criticism from different sects in the world. But in this up-rising assault of information warfare, cyber-terrorism and ideological extremism, it’s the time for the authorities to sit back and define the limitations of this free source. Before legitimatizing the use of internet, it would be important to keep in mind the reasons behind following. †¢ Spectrum of cyber-terrorism: what exactly comes in it? †¢ Need of regulating the flow of information on internet†¢ Why ideological extremism exists? †¢ What are the factors leading to innocent people ending up terrorist? †¢ What lacks in the social structure that is prompting such activities? †¢ How the use of internet is provoking extremism in up-coming generation †¢ Who are propagating the information to provoke such behavior †¢ Are we ready to fight this front of terrorism †¢ Is there any social remedial for a terrorist? With this research, we are aiming to find out the reasons behind all these above mentioned issues. Terrorists are humans, but they have opted the wrong way. Are they smarter than us?There is a big question mark on the upcoming days, as international security continues to be threatened by extremists. CONTRIBUTION TOWARDS THE KNOWLEDGE This research is expected to bring forward key reasons behind the amalgamation of two concepts, cyber-terrorism and ideological extremism, to bring forw ard a new front in the war against terrorism. Through this research, we aim to: †¢ Understand the ideology behind use of internet to spread extremism †¢ Understand policies adopted majorly by, Muslim world leader, Saudi Arabia and, the economic giant, United Kingdom to secure their respective people.†¢ Reveal threats that are present to the respective monarchies. †¢ Facilitate the policy makers with succinct information to start with. †¢ Explore different fronts that these extremists target to exploit youth †¢ Find out the weakness in our social systems that allows these ideologies to be successful †¢ Discover the spectrum of sources in which cyber terrorism exists. †¢ Find the roots of ideological extremism and its effects on current monarchy RESEARCH METHODOLOGY This research will be divided into two parts, as per the two portions of research question.To take views on â€Å"whether ideological extremism is terrorism or not†, cyber-ter rorism to be specific, we will rely on qualitative measures of research. On the other hand, to find the â€Å"extent† to which terrorists are making use of information warfare to spread ideological extremism, we will use quantitative measures of research. Qualitative Research Through this research, we wish to: †¢ Understand views of respondents about the issue †¢ Solicit their approach in reaching their respected viewpoints. †¢ Explore the difference in opinion that exists in policy makers †¢ Consider the possible impact of their thoughts over the people.Quantitative Research Through this approach, we wish to: †¢ Understand the perception of youngsters about this issue †¢ Discriminate respondents on the basis of their ethnicity and racism to understand involvement of any pattern among people of similar sects. †¢ Materialize our results and statistically analyze how many of them could possibly be a victim of those terrorists in near future. S ample For Qualitative research, we aim to take inputs from different critics, terrorism analysts, cyber-crime writers, internet regulatory bodies, extremist group leaders, journalists, and writers on â€Å"extremism†.These people will be selected on the basis of relevance, work in the respective fields, availability and quality of work. For Quantitative research, we aim to survey young students studying in different continents of the world. As all of them will be everyday user of internet, we also aim to distinguish them on the basis of their involvement in internet, and their socio-ethnic mindset about ideological extremism. Variables Major variables in the research will be: (measured as) †¢ Involvement in current affairs (Ratio Scale: Weight assigned to each answer)†¢ Knowledge about the issue (Ratio Scale: Weight assigned to each answer) †¢ Understanding of issue (Ordinal Scale) †¢ Involvement with the internet (Ordinal Scale) †¢ Awareness about po ssible implications of issue (Ordinal Scale) †¢ Views about the issue (Nominal Scale) Monitoring All these results will be checked for reliability, validity and practicality, as per the methods defined by the monitoring/scrutinizing body. These checks will ensure the consistency of responses, and the validity of data will be checked based upon two optimum limits provided by the monitoring body.PILOT STUDY In order to conduct a pilot study on the above mentioned topic, the literature selected, for secondary research, as a source of Qualitative research is linked in the appendix A. Purpose of this study is to understand the perspective of officials of Saudi Government regarding terrorism and ideological extremism. This study was analytical, as qualitative measures were expected out of this study. Description The document comprises of official statements by Saudi government and religious representatives.Their statements usually revolve around the issues of terrorism, war against t errorism, extremism and the teachings of Islam, combating extremist ideology, role of mosque as an institution, condemning immoral, unethical acts and supporting moderation. They withheld their solid stance against terrorism, and declared any one fighting against the custodians of Holy Ka’aba as non-Muslim. They also instigate their support to find out and tackle the roots of terrorism and extremism. Their stance on condemning extremism, violence and any form of terrorism is mitigating with the learning of Islam.Their religious scholars emphasized on the need of omitting deviant ideologies that have been developed between Muslims, and join together united as one creed, as a Muslim. They also highlighted that the reasons of deviant ideologies are lack of knowledge about the religion, and prejudiced in Fatwa. Most of their statements emphasized upon the basic theme of Islam, peace. They extended full support to international community in the war against terrorism. Outcomes of t he study Learning from the pilot study reveals †¢ Saudi government takes terrorism as a threat to its nation, its territory, its religion, all Muslim Ummah, and non-Muslims.†¢ They are the custodians of Holy places of Muslims. They take it as their duty to defend the religion that was gifted to them by their Holy Prophet. †¢ All of the officials agree upon the solid stance they have against terrorism. They want to unite Muslims in order to protect the religion which has been badly reputed by ideological extremists. †¢ Their views are diverged towards the central goal of achieving a peaceful state. They are being the voice of nation, and they stand to serve their people justly, with their lives and properties secured.

Film Reveiw-Two Can Play at that Game essays

Film Reveiw-Two Can Play at that Game essays STARRING: Vivica .A. Fox, Morris Chestnut CRITICS WARNING: Sexual References, little offensive language, but great storyline. Colour 123 minutes Is your man playing up? Showing signs of infidelity or as Shante Smith (Vivica. A. Fox) would say... Is Your Man Showing His Ass? Director Mark Brown certainly knows how to entertain the female sex with a boy punching plot to capture any womans mind on a revenge pursuit to get back at her unfaithful man. An interesting style to this film is the narration of the storyline by the main character Shante Smith. It is a fun humorous film where black Americans and their comical ways deal with relationships set in the rich area of America Suburbia. Shante Smith- Senior Advertising executive from Parker and Law has a great life with no worries. Shante is the envy of her three best friends (Carla, Dianne, Leslie) as their relationships are failing. She uses their experiences with men as examples to relate advice to women. One example she provides is that the most common excuse from men, for a woman to know her man is cheating, is Im Working late! One night when she and the girls get together to have a few drinks her man Keith (Morris Chestnut) calls to say he cant make it because hes Working Late! Now Shante is forced to launch her 10 day plan to get him back into her arms using some very intriguing tactics. It is a captivating story of a woman who thought she had it all. Now she must use her own advice for her own experiences. It is a very easy film to follow as it transforms into in a 10 day sequence. The drama of Shantes efforts to retrieve her man is very entertaining. Set in the wealthy areas of America, there is more focus on the attractive actors than any scenery within the film. Fox plays an excellent role as the dominant female, leading the way, until she meets rival Conn ...

Answers for ESL Learners

Answers for ESL Learners What are Adjectives? Adjectives are words that describe objects, people and places. She has a fast car. - Fast  describes the car.Susan is very intelligent.- Intelligent  describes Susan.Thats a beautiful mountain. - Beautiful describes mountain. In other words, adjectives describe characteristics of different things.   There are nine types of adjectives which are explained below. Each type of adjective includes a link to further details of the particular grammar usage. Descriptive Adjectives Descriptive adjectives are the most common type of adjective and are used to describe a certain quality such as large, small, expensive, cheap, etc. of the object. When using more than one descriptive adjective, it is important to make sure that they are placed in the correct  adjective order. Jennifer has a difficult job.That sad boy needs some ice cream.Susan purchased an expensive car. Proper Adjectives Proper adjectives are derived from  proper nouns  and must always be capitalized. Proper adjectives are often used to show the origin of something. Proper adjectives are also often the name of a language or a people.   French tires are excellent.Italian food is the best!Jack prefers Canadian maple syrup. Quantitative Adjectives Quantitative adjectives show us how many of something is available. In other words, numbers are quantitative adjectives. However, there are other quantitative adjectives such as  several, many, a lot of  which are also known as  quantifiers. There are two birds in that tree.She has many friends in Los Angeles.I count sixteen mistakes on your homework. Interrogative Adjectives Interrogative adjectives are used to ask questions. Interrogative adjectives include which and what. Common phrases using interrogative adjectives include:  Which type / kind of and what type / kind of plus a noun.   Which kind of car do you drive?What time should I come?What type of ice cream do you like? Possessive Adjectives Possessive adjectives  are similar to subject and object pronouns, but they indicate possession.  Possessive adjectives include my, your, his, her, its, our, and their.   My house is on the corner.I invited their friends to dinner.Her dog is very friendly. Possessive Nouns Possessive nouns act like possessive adjectives but are formed by using a noun.  Possessive nouns are created by adding an apostrophe to a noun to indicate possession such as the  cars color, or the  friends vacations. Toms best friend is Peter.The books cover is misleading.The houses garden is beautiful. Predicate Adjectives Predicate adjectives are placed at the end of a sentence or clause to describe the noun at the beginning of a sentence. Predicate adjectives are often used with the verb to be. His job is stressful.The vacation was enjoyable.It probably isnt very easy. Articles Definite and indefinite articles  can be thought of as a type of adjective because they describe the noun as one of many or a specific instance of a particular object.  Ã‚  A  and  an  are indefinite articles,  the  is the definite article. Tom would like an apple.She wrote the book thats on the table.I ordered a glass of beer. Demonstrative Pronouns Demonstrative pronouns  show which objects (noun or noun phrase) is meant. Demonstrative pronouns include  this, that, these  and  those.  This  and  that  are singular demonstrative adjectives, while these and those are plural. Demonstrative pronouns are also known as  determiners. I would like that sandwich for lunch.Andrew brought these books for everyone to read.Those trees are beautiful! Adjectives Quiz Find the adjective and  identify its form. Choose from: descriptive adjectiveproper adjectivequantitative adjectiveinterrogative adjectivepossessive adjectivepossessive nounpredicate adjectivedemonstrative pronoun I gave the ball to her cousin.Education is important.They have a beautiful daughter.Which kind of car did you decide to buy yesterday?Those cars belong to Peter.She has a lot of friends in China.Chicago is amazing!Jennifer proposed an elegant solution to the problem.What kind of grades did you get?Helens house is located in Georgia.  Italian food is the best!Holidays can be boring at times.  Alex has three books.Its a hot day.Our friend didnt answer the question. Answers: her - possessive adjectiveimportant - pronominal adjectivebeautiful - descriptive adjectivewhich kind of - interrogative adjectivethose - demonstrative pronouna lot of - quantitative adjectiveamazing - pronominal adjectiveelegant - descriptive adjectivewhat kind of - interrogative adjectiveHelens - possessive nounItalian - proper adjectiveboring - pronominal adjectivethree - quantitative adjectivehot - descriptive adjectiveour - possessive adjective

Astr hw4 Essay Example | Topics and Well Written Essays - 500 words - 1

Astr hw4 - Essay Example With the activities that occur in the volcano that is the first theory, the earth experienced the cooling that made the elements cool. The elements are then exposed to the atmosphere creating a combination of droplets. With the theory water is known to be the found on the earth’s surface. The theory does not fully explain the source since seventy percent of the water sources does not originate from the earth’s surface. In the second theory, water is meant to be formed from the comets and the earth grazing. This means that the water exists in form of the water molecules on the earth’s surface. At the same time, there is a difference between water at the sea and the one on the earth’s surface (Wiegandt, 2008). 3. The snowball theory gives a brief discussion on the coldest part of the earth. The theory suggests that the earth is all surrounded by ice. There is evidence supporting the theory by the fact that Sturtian and Marinoan have isotopes of carbon that is found at the sea water. There are also a number of marine deposits at the bark of the oceans. The irons and oxides formed enable the anoxia to spread into the oceans. There are also proofs that do not support the theory because the deposits don’t have same ages not even the age sets. The Sturtian has ripples while its thickness and characters are found at the base. 4. Europa the moon has liquid that is in form of water and can primitively save living things. The liquid has got characters that will enable the human life by containing molecules that are versatile. The liquid also dissolve the nutrients that are used in the digestion and waste removal by the living creatures. Europa also has the ability to tilt the surface enabling it to have life support. 5. With the origin of life, life is reported to start from the sea because of the structures like carbonate that are found at the vents of hydrothermal. With the formation of hydrogen sulphide, hot

Mutation of DNA Essay Example | Topics and Well Written Essays - 1250 words

Mutation of DNA - Essay Example Transversion mutation involves the substitution of purine by pyrimidine and pyrimidine by purine. This type of mutation is rare due to steric problems of pairing purines with purines, and pyrimidine with pyrimidines. This type of mutation takes place due to chemical modification in a base. The chemical modification is caused due to two reactions one is deamination and second is depurination. In deamination Cytosine occasionally loose an amino group and then it is converted to Uracil. This resulted in pairing of Uracil-Guanin instead of Cytosine-Guanin. It is well known that Uracil pairs with Adenin. After Uracil-Adenin pair in first round of replication, thymine takes the place of Uracil in second round of replication. And finally Cytosine - Guanin pair is converted to Adenin - thymine Pair. In depurination loss of purine group (Adenine or Guanin) takes place. Due to deletion and insertion of one or a few nucleotides in DNA molecule, the shifting of reading frame of nucleotide takes place either in backward or in forward position, this results into a mutation. This is known as frameshift mutation. Generally this mutation occurs where there is a short repeated nucleotide sequence. Any agent that directly cause damage to the DNA alters the base sequence or interferes with repairing system is known as mutagens. Mutagens may be some chemical or radiation. Here we are discussing how the mutagen can act: 1) Base Analogues: A base analogue is a chemical compound similar to the one or four bases of DNA. During normal replication process this base analogue can be incorporated into growing polynucleotide chain. For Example 5-Bromouracil (5-BU) is an analogue of thymine. It can pair with adenine in polynucleotide chain by replacing thymine. During the replication keto-form of 5-BU Substitutes for thymine and the replication of an initial Adenin:Thymine (A:T) pair becomes an A:BU pair. The rare enol form of 5-BU that pairs with Guanin is the first mutagenic round of replication. In the next round of replication Guanin pairs with cytosine. So that transition is completed from A:T to G:C pair. 2) Chemical Changing the Specificity of Hydrogen Bonding. There are many chemicals that after incorporation in DNA change the specificity of hydrogen bonding. For example Nitrous Oxide (HNO2) converts the amino group of the bases into keto group through oxidative deamination. Deamination of adenine results in formation of hypoxanthine, the pairing behavior of which is like guanine. Hence it pairs with cytosin