Consider the following figure.It indicates that a single amino acid substitution ______.
A) always involves adenine and uracil
B) may alter a protein so that it no longer functions properly
C) is a silent mutation
D) causes a nonsense mutation

Question

Consider the following figure.It indicates that a single amino acid substitution ______. 
A) always involves adenine and uracil 
B) may alter a protein so that it no longer functions properly 
C) is a silent mutation 
D) causes a nonsense mutation

Quizplus · Accepted Answer

A single amino acid substitution can alter the amino acid sequence of a protein, potentially changing its structure and function. If the substitution occurs in a critical part of the protein, it may no longer function properly. Therefore, B is the best choice. A is incorrect because amino acid substitutions can involve any combination of the four nucleotides that make up RNA (adenine, uracil, cytosine, and guanine), not just adenine and uracil. C is incorrect because a silent mutation does not result in a change to the amino acid sequence, whereas a substitution does. D is incorrect because a nonsense mutation results in premature termination of translation, not just a substitution of one amino acid for another.

Consider the Following Figure