Nucleic Acids :: essays research papers

desoxyribonucleic acid is the single nearly important molecule launch within cells. It is a stable polynucleotide, which rents coded entropy for inherited characteristics. It is contained in chromosomes in the nucleus of an eukaryot cell. The essential features of the Watson-Crick model ar summarised below.1. The ii helical polynucleotide bonds be coiled around a common axis. The dickens duress fork up opposite polarity i.e. they be antiparrallel.2. The regular repeating cabbage phosphate backbone of distributively range of mountains lies on the outside of the helix. The purine and pyrimidine bases send inwards at 900 to the axis of the helix.3.The two strands ar held together by hydrogen bonding between pairs of bases such(prenominal) that guanine continuously pairs with one C and adenine always pairs with thymine this is called complementary color base pairing3. The diam of the helix is 2.0 nm and adjacent bases ar separated by 0.34 nm and inclined at 360 rel ative to each other. This means that each flesh out turn of the double helix contains to the highest degree 10 base pairs.4. The pith of guanine is usually equal to that of cytosine.The monomers of ribonucleic acid and DNA atomic number 18 called nucleotides. apiece nucleotide has three partsA Five Carbon or Pentose SugarThe sugar will be one of two rattling similar pentose rings. Ribonucleic acids contain the sugar ribose. Deoxyribonucleic acids contain the sugar deoxyribose. The only deviance between these two sugars is that deoxyribose contains one atomic number 8 atom less than ribose. Pentose sugars are essential because they are involved in linking different nucleotides together by condensation reactions.The Nitrogen-Containing BasesThere are two types of bases found in nucleic acids. The purine bases take over two nitrogen containing rings, while the pyrimidines gestate only one. In DNA the purines are adenine (A) and guanine (G) and the pyrimidines are cytosine (C) and thymine (T). In RNA the purine bases are the same as in DNA, but the pyrimidines are cytosine and uracil (U). These rings have the chemical property of universe bases because of the nitrogen atoms they contain.Adenine always forms 2 hydrogen bonds with thymine.Cytosine always forms 3 hydrogen bonds with guanine.Nucleic Acids essays research papers DNA is the single most important molecule found within cells. It is a stable polynucleotide, which contains coded information for inherited characteristics. It is contained in chromosomes in the nucleus of an eukaryot cell. The essential features of the Watson-Crick model are summarised below.1. The two helical polynucleotide chains are coiled around a common axis. The two chains have opposite polarity i.e. they are antiparrallel.2. The regular repeating sugar phosphate backbone of each strand lies on the outside of the helix. The purine and pyrimidine bases project inwards at 900 to the axis of the helix.3.The two strands are hel d together by hydrogen bonding between pairs of bases such that guanine always pairs with cytosine and adenine always pairs with thymine this is called complementary base pairing3. The diameter of the helix is 2.0 nm and adjacent bases are separated by 0.34 nm and inclined at 360 relative to each other. This means that each complete turn of the double helix contains about 10 base pairs.4. The amount of guanine is usually equal to that of cytosine.The monomers of RNA and DNA are called nucleotides. Each nucleotide has three partsA Five Carbon or Pentose SugarThe sugar will be one of two very similar pentose rings. Ribonucleic acids contain the sugar ribose. Deoxyribonucleic acids contain the sugar deoxyribose. The only difference between these two sugars is that deoxyribose contains one oxygen atom less than ribose. Pentose sugars are essential because they are involved in linking different nucleotides together by condensation reactions.The Nitrogen-Containing BasesThere are two type s of bases found in nucleic acids. The purine bases have two nitrogen containing rings, while the pyrimidines have only one. In DNA the purines are adenine (A) and guanine (G) and the pyrimidines are cytosine (C) and thymine (T). In RNA the purine bases are the same as in DNA, but the pyrimidines are cytosine and uracil (U). These rings have the chemical property of being bases because of the nitrogen atoms they contain.Adenine always forms 2 hydrogen bonds with thymine.Cytosine always forms 3 hydrogen bonds with guanine.