Figure 15.3
Above is a metabolic pathway for the synthesis of an amino acid (E), without which an organism could not live. Enzymes are represented by numbers, and substrates by letters. Use this figure for the next two questions.
-According to the figure above,if enzyme 3 was nonfunctional in an organism,which of the following outcomes would you predict?
A)The cell would die because of a lack of the essential amino acid.
B)Another enzyme would be able to catalyze the reaction and the pathway would proceed.
C)Substrate C would accumulate,and there would be no substrate D formed.
D)Lack of enzyme 3 would result in a cessation (halt)of the entire metabolic pathway.

Question

Figure 15.3  
Above is a metabolic pathway for the synthesis of an amino acid (E), without which an organism could not live. Enzymes are represented by numbers, and substrates by letters. Use this figure for the next two questions.
-According to the figure above,if enzyme 3 was nonfunctional in an organism,which of the following outcomes would you predict?
A)The cell would die because of a lack of the essential amino acid. 
B)Another enzyme would be able to catalyze the reaction and the pathway would proceed. 
C)Substrate C would accumulate,and there would be no substrate D formed. 
D)Lack of enzyme 3 would result in a cessation (halt)of the entire metabolic pathway.

Quizplus · Accepted Answer

If enzyme 3 is nonfunctional, substrate C would accumulate because it cannot be converted to substrate D, and no substrate D would be formed.