The following question refers to this figure of a simple metabolic pathway:

-If A, B, and C are all required for growth, a strain mutant for the gene-encoding enzyme B would be capable of growing on which of the following media?
A) minimal medium
B) minimal medium supplemented with A only
C) minimal medium supplemented with B only
D) minimal medium supplemented with C only
E) minimal medium supplemented with nutrients A and B

Question

The following question refers to this figure of a simple metabolic pathway:
 
-If A, B, and C are all required for growth, a strain mutant for the gene-encoding enzyme B would be capable of growing on which of the following media?
A) minimal medium 
B) minimal medium supplemented with A only 
C) minimal medium supplemented with B only 
D) minimal medium supplemented with C only 
E) minimal medium supplemented with nutrients A and B

Quizplus · Accepted Answer

A strain mutant for the gene-encoding enzyme B cannot produce B on its own, so it requires an external supply of B to grow. Since C is the product of the pathway involving A and B, supplementing the medium with C bypasses the need for B, allowing growth.

The Following Question Refers to This Figure of a Simple