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Recall from our classes on molecular evolution that some proteins evolve more rapidly than others. For example, the oxygen-carrying protein myoglobin evolves more quickly than the D1 protein of photosystem II.
What explains this difference in the rate of protein evolution?
- A. Changes to the sequence of some proteins can be tolerated as they don't alter fitness; for other proteins, sequence changes are usually harmful.
- B. In constrained proteins like D1, evolution results primarily from nucleotide changes that alter the amino acid sequence of the protein.
- C. Proteins like myoglobin have evolved more recently than proteins like D1 and thus have been forced to evolve more quickly.
- D. Protein evolution is dependent upon the rate of gene mutation and some genes have a higher rate of mutation than others.
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