2.A. DNA structure, function
DNA (deoxyribonucleic acid) is a polymer (repeating units) of nucleotides.
The DNA nucleotide includes a (1) nitrogenous base; (2) pentose sugar; and (3) phosphate group, i.e.:
DNA nucleotides differ only in their nitrogenous base. The 4 nitrogenous bases are: (1) adenine (A); (2) guanin (G); (3) cytosine (C); (4) thymine (T), i.e.:
Adenine and guanine are 2 ring structures called purines. Cytosines and thymine are single ring structures called pyrimidines.
2.A.1 Double-helix structure
More info: http://www.biochem.umass.edu/mydna/discovery.html
2.A.2 DNA composition (purine and pyrimidine bases, deoxyribose, phosphate)
More info: http://www.johnkyrk.com/DNAanatomy.html
2.A.3 Base-pairing specificity, concept of complementarity
2.A.4 Function in transmission of genetic information
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