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DNA Structure questions. Outline DNA nucleotide structure in terms of sugar (deoxyribose), base and phosphate.

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Introduction

Biology II 11/24/08 3.3 DNA Structure 3.3.1 Outline DNA nucleotide structure in terms of sugar (deoxyribose), base and phosphate. The sugar is part of the 5-carbon molecule in its ring form. Deoxy means that one oxygen has been lost. There are 5 different bases that make up the DNA and RNA (Eggling 1). The five are: cytosine, adenine, thymine, guanine, and uracil. Uracil is only present in RNA and thymine is only present in DNA (Eggling 1). ...read more.

Middle

adenine (A) guanine (G) (Eggling 1) 3.3.3 Outline how DNA nucleotides are linked together by covalent bonds into a single strand. A nucleotide is a combination of a phosphate, a sugar, and a base. They are made up of the four bases stated in 3.3.2. Adenine and guanine are called purines and are made up of two carbon rings (Bowen 1). Cytosine and Thymine are called pyrimidines are consist of a single carbon ring (Bowen 1). ...read more.

Conclusion

3.3.4 Explain how a DNA double helix is formed using complementary base pairing and hydrogen bonds. Complementary base pairing is the bonding between the base pairs Adenine-Thymine and between Guanine-Cytosine. Hydrogen bonds are what make up the bonds between the two bases (May 1). Like stated in 3.3.3 A-T consists of two bonds between each other and G-C consists of 3 (Ophardt 1). The reason for the twist in the ladder shaped formation is because the complementary bases are pulling inwards in order to bring the bonds closer together. Thus a double helix shape is formed from using complementary bases. ...read more.

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