Question

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multiple choice question
what is an example of protein sequence similarity among species?
the shape of a sharks body and the shape of a dolphins body
mitochondrial dna similarity
sheep keratin and the keratin in human hair
duplication of homologous genes

Explanation:

To determine the example of protein sequence similarity among species, we analyze each option:

• The shape of a shark’s and dolphin’s body is a structural/analogous trait, not related to protein sequences.
• Mitochondrial DNA similarity refers to DNA, not protein sequences.
• Sheep keratin and human hair keratin are proteins. Keratin is a structural protein, and similarities in their sequences across species (sheep and human) would be an example of protein sequence similarity.
• Duplication of homologous genes is about gene duplication, not protein sequence similarity.

Answer:

C. sheep keratin and the keratin in human hair