Glycolysis and Its Regulatory Mechanisms

Why is glycolysis considered a high-yield topic in biochemistry?

• It is not relevant to human metabolism.

• It is the most complex biochemical pathway.

• It is the only pathway that produces ATP.

• It is the first pathway learned in biochemistry and frequently appears on exams.

What is the primary goal of glycolysis?

• To synthesize proteins from amino acids.

• To break down glucose into pyruvate and generate ATP.

• To produce glucose from pyruvate.

• To convert glucose into glycogen.

Which enzyme acts as a glucose sensor and is only active at high glucose concentrations?

• Hexokinase

• Phosphofructokinase

• Glucokinase

• Pyruvate kinase

What is the role of hexokinase in glucose metabolism?

• It is only active during high glucose concentrations.

• It maintains basal glucose metabolism in all tissues.

• It converts pyruvate to glucose.

• It is only active in the liver.

Which enzyme is the rate-limiting step in glycolysis?

• Phosphofructokinase 1 (PFK-1)

• Hexokinase

• Pyruvate kinase

• Glucokinase

What effect does ATP have on phosphofructokinase 1 (PFK-1)?

• It activates PFK-1.

• It inhibits PFK-1.

• It has no effect on PFK-1.

• It converts PFK-1 to pyruvate.

How does AMP affect the activity of phosphofructokinase 1 (PFK-1)?

• AMP inhibits PFK-1.

• AMP activates PFK-1.

• AMP converts PFK-1 to glucose.

• AMP has no effect on PFK-1.

What is the role of phosphofructokinase 2 (PFK-2) in glycolysis?

• It converts pyruvate to lactate.

• It converts glucose to glycogen.

• It inhibits glycolysis.

• It promotes glycolysis by producing fructose 2,6-bisphosphate.

Which hormone promotes the activity of phosphofructokinase 2 (PFK-2)?

• Glucagon

• Insulin

• Adrenaline

• Cortisol

What is the effect of citrate on pyruvate kinase?

• Citrate activates pyruvate kinase.

• Citrate inhibits pyruvate kinase.

• Citrate converts pyruvate kinase to glucose.

• Citrate has no effect on pyruvate kinase.