DNA molecules consist of chemically linked sequences of the bases adenine, guani

Question

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.

1) Represent all possible base sequences using a tree diagram.

2) How many different codons are there?

3) 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?

4) How many codons consist of three different bases?

Explanation / Answer

DNA molecules consist of chemically linked sequences of the bases adenine, guani

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