試題詳解

3. Which of the following contradicts the one-gene, one-enzyme hypothesis?
(A) Alkaptonuria results when individuals lack a single enzyme involved in the catalysis of homogentisic acid.
(B) Sickle-cell anemia results in defective hemoglobin.
(C) A mutation in a single gene can result in a defective protein.
(D) A single antibody gene can code for different related proteins, depending on the splicing that takes place post-transcriptionally.
(E) Human insulin is encoded by one gene and processed after translation into two conjugated polypeptides for its active form.