Question

How many different codons can code for the amino acid tryptophan (Trp)?

A) 1
B) 3
C) 4
D) 6

Answer 1

The chart very nicely lays out the amino acid each codon corresponds to. You're looking for "trp" in the chart, which only appears once, beside the UGG codon. Therefore, only one codon codes for tryptophan.

Answer 2

The answer to you question is A