You are a virologist interested in studying the evolution of viral genomes. You are studying two newly isolated viral strains and have sequenced their genomes. You find that the genome of strain 1 contains 25% A, 55% G, 20% C, and 10% T. You report that you have isolated a virus with a single-stranded DNA genome. Based on what evidence can you make this conclusion?
(a) single-stranded genomes always have a large percentage of purines
(b) using the formula: G - A = C + T
(c) Double-stranded genomes have equal amounts of A and T
(d) Single-stranded genomes have a higher rate of mutation
Answer: C