Question

question 25 of 25
what is the main function of the krebs cycle?
a. producing large numbers of atp molecules
b. using pyruvate to make energy carriers
c. producing oxygen for use in photosynthesis
d. breaking down energy carriers

Explanation:

The Krebs cycle (citric acid cycle) takes pyruvate (from glycolysis) and through a series of reactions, generates energy - carrying molecules like NADH and FADH₂. These molecules then go on to the electron transport chain to produce ATP. Option A is incorrect because most ATP is produced in the electron transport chain, not the Krebs cycle. Option C is wrong as oxygen is not produced in the Krebs cycle (photosynthesis produces oxygen). Option D is incorrect as the Krebs cycle synthesizes energy carriers, not breaks them down.

Answer:

B. Using pyruvate to make energy carriers