A metabolic pathway,glycolysis,is active when cellular energy levels are ________;the regulatory enzyme,phosphofructokinase,is ________ by ATP.
A)low;activated
B)low;inhibited
C)high;activated
D)high;inhibited

Question

Quizplus · Accepted Answer

Glycolysis is a catabolic pathway that breaks down glucose to produce ATP. It is activated when cellular energy levels are low and there is a need for ATP. Phosphofructokinase is a regulatory enzyme in glycolysis that controls the rate-limiting step. It is inhibited by ATP, which means that when the ATP levels are high, the enzyme activity is reduced, and glycolysis slows down. Therefore, B is the correct choice as it describes the situation where cellular energy levels are low (activating glycolysis) and the regulatory enzyme, phosphofructokinase, is inhibited by ATP.

A Metabolic Pathway,glycolysis,is Active When Cellular Energy Levels Are ________;The