ExplanationA. False. Cytochrome c is a slowly evolving protein. Hence, so it is notsuitable for establishing evolutionary relationships between closely relatedspecies. (The Science of Genetics, Atherly A.G.; Girton J.R.; McDonaldJ.F. pp. 695).B. True. Different parts of the same gene evolve at different rates. Those partsof genes that have the least effect on function tend to evolve at highestrates. The idea of the molecular clock is that individual proteins and genesevolve at a constant rate and that the differences in the sequences ofpresent-day organisms can be used to date past evolutionary events.Reference: Genetics a conceptual approach. Pp. 740.