Which of the following statements is true regarding enzyme pathways?
A) the most effective way to control a pathway is to regulate every enzyme in the pathway
B) an enzyme pathway always proceeds in only one direction, never in reverse
C) a regulatory enzyme is regulated only by molecules within the given pathway
D) metabolic pathways are necessary since enzymes usually catalyze only one specific reaction
E) none of the above are true

Question

Quizplus · Accepted Answer

Enzymes usually catalyze only one specific reaction, therefore metabolic pathways are necessary to ensure that the correct reaction occurs in the correct sequence. Option A is incorrect because controlling every enzyme in a pathway can be inefficient and impractical. Option B is incorrect because some pathways can be reversible, depending on the conditions. Option C is incorrect because regulatory enzymes can be influenced by molecules outside of the pathway as well.

Which of the Following Statements Is True Regarding Enzyme Pathways