Use the figure to answer the question.

Refer to the metabolic pathway illustrated. If A, B, and C are all required for growth, a strain that is mutant for the gene-encoding enzyme A would be able to grow on medium supplemented with which of the following nutrient(s)?
A) nutrient A only
B) either nutrient B or C
C) nutrient C only
D) nutrients A and C

Question

Use the figure to answer the question.

Refer to the metabolic pathway illustrated. If A, B, and C are all required for growth, a strain that is mutant for the gene-encoding enzyme A would be able to grow on medium supplemented with which of the following nutrient(s)?
A) nutrient A only 
B) either nutrient B or C 
C) nutrient C only 
D) nutrients A and C

Quizplus · Accepted Answer

A strain that is mutant for the gene-encoding enzyme A would not be able to synthesize C, as it is the precursor for C. However, it would be able to take up and utilize B, as it is downstream of A in the pathway. Therefore, the strain would be able to grow on medium supplemented with either nutrient B or C.

Use the Figure to Answer the Question