In a missense mutation:
A) All the amino acids beyond the mutation point are changed.
B) A nucleotide is added to the DNA.
C) A nucleotide is deleted from the DNA.
D) A single amino acid is altered.
E) The protein is always completely nonfunctional.

Question

Quizplus · Accepted Answer

In a missense mutation, a single nucleotide is changed, leading to the substitution of a single amino acid in the protein sequence. This can affect the protein's structure and function, but it does not necessarily render the protein completely nonfunctional. Therefore, the best choice is D, which describes a single amino acid being altered.

In a Missense Mutation