Which of the following is a characteristic of homologous proteins from different organisms?
A)They have very little sequence similarity with other proteins with similar function.
B)They have nearly identical lengths.
C)They do not share a significant degree of sequence similarity.
D)They have sequence similarity indirectly correlated to the relatedness of the species from which they were derived.

Question

Quizplus · Accepted Answer

Homologous proteins from different organisms have the same or similar functions and structures, as they evolved from a common ancestor. Therefore, they often have similar lengths and primary sequences, despite some variations that may have accrued over time due to natural selection and genetic drift. Choice A is incorrect because homologous proteins often have significant sequence similarity with other proteins with similar functions. Choice C is incorrect because homologous proteins have significant sequence similarity, which is a key indicator of their homology. Choice D is incorrect because sequence similarity is directly proportional to the relatedness of the species from which homologous proteins were derived.

Which of the Following Is a Characteristic of Homologous Proteins