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 active when cellular energy levels are low, as it is the initial step of cellular respiration to produce ATP. When ATP levels are high, phosphofructokinase, the regulatory enzyme in glycolysis, is inhibited. This is due to ATP acting as a negative feedback regulator, preventing excessive ATP production. Therefore, option B is the correct answer.

Glycolysis Is Active When Cellular Energy Levels Are ________; the Regulatory