Grt! Nucleic Acids

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Nucleic Acids Competency 208.5.1 Melissa Kelleher, RN

The Structure of DNA • DNA is composed of units called nucleoCdes, (Wolfe, 2000). • NucleoCdes are composed of a phosphate group, a deoxyribose sugar, and a nitrogenous base, (Wolfe, 2000). – Purines – nitrogenous bases that composed of two rings, (Wolfe, 2000). – Pyrimadines – nitrogenous bases composed of one ring, (Wolfe, 2000).

The Structure of DNA • DNA is a double helix structure of nucleoCdes wound together in an anCparallel direcCon, (Wolfe, 2000). – Hydrogen bonds form between the nitrogenous bases, (Wolfe, 2000). – Base pairs only bond in specific pairs, (Wolfe, 2000). • Adenine bonds only with thymine, (Wolfe, 2000). • Guanine bonds only with cytosine, (Wolfe, 2000).

• Deoxyribose sugars line up in one direcCon, considered the 51 to 31 direcCon, in one strand of DNA, and in the opposing direcCon, considered the 31 to 51 direcCon, creaCng and anCparallel orientaCon, (Wolfe, 2000).

The Structure of DNA

DNA ReplicaCon • DNA replicaCon is a semi-­‐conservaCve process, by which each strand of DNA is used as a template for the new strand of DNA being replicated,…...

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