Cytochrome c is a vital protein that functions as an electron acceptor in the electron transport chain within the mitochondria of all eukaryotic cells. It is composed of 104 amino acids linked in a chain that surrounds a heme (Fe) group. A scientist used the amino acid sequence of cytochrome c in different species to consider evolutionary relationships. The data below summarize the number of differences in the amino acid sequences of cytochrome c found in selected species.
human-chimpanzeeno difference
human - rhesus monkey1 difference
human - horse/donkey7 differences
human - cows,pigs or sheep7 differences
human - rabbit7 differences
mammals - birds/reptiles10-15 differences
fish - land vertebrates18-20 differences
plants - animals45-48 differences
6. Interpretation of the data supports which of the following statements?
1) rhesus monkeys are more closely related to rabbits than they are to horses
2) horses and cows have identical amino acid sequences in their cytochrome c
3) fish and land vertebrates are more closely related to each other than mammals are to birds
4) mammals are more closely related to reptiles than they are to fish
human-chimpanzeeno difference
human - rhesus monkey1 difference
human - horse/donkey7 differences
human - cows,pigs or sheep7 differences
human - rabbit7 differences
mammals - birds/reptiles10-15 differences
fish - land vertebrates18-20 differences
plants - animals45-48 differences
6. Interpretation of the data supports which of the following statements?
1) rhesus monkeys are more closely related to rabbits than they are to horses
2) horses and cows have identical amino acid sequences in their cytochrome c
3) fish and land vertebrates are more closely related to each other than mammals are to birds
4) mammals are more closely related to reptiles than they are to fish