Figure 16.3 Above Is a Metabolic Pathway for the Synthesis of an of an Amino

Multiple Choice

Figure 16.3
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 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) Substrate C would accumulate, and there would be no substrate D formed.
C) Lack of enzyme 3 would result in a cessation halt) of the entire metabolic pathway.
D) Another enzyme would be able to catalyze the reaction and the pathway would proceed.