When cytochrome c molecules are compared, yeasts and molds are found to differ by approximately 46 amino acids per 100 residues (amino acids in the protein); insects and vertebrates are found to differ by 29 amino acids per 100 residues. What can one conclude from these data?
a. Insects and vertebrates diverged from a common ancestor more recently than did yeasts and molds.
b. Very little, unless the DNA sequences for the cytochrome c genes are compared.
c. Yeasts evolved from molds, but vertebrates did not evolve from insects.
d. Yeasts and molds diverged from a common ancestor more recently than did insects and vertebrates.
e. The evolution of cytochrome c occurred more rapidly in yeasts and molds than in insects and vertebrates.
Answer: a. Insects and vertebrates diverged from a common ancestor more recently than did yeasts and molds.
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