DNA molecules consist of chemically linked sequences of the bases adenine, guanine, cytosine, and thymine, denoted A, G, C, and T. A sequence of three bases is called a codon. A base may appear more than once in a codon.
a. How many different codons are there?
b. The bases A and G are purines, while C and T are pyrimidines. How many codons are there whose first and third bases are purines and whose second base is a pyrimidine?
c. How many codons consist of three different bases?
a) (4)(4)(4) = 64
(b) (2)(2)(2) = 8
(c) (4)(3)(2) = 24
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