Question

What happens to pyruvate molecules formed in glycolysis in the absence of oxygen?

They will enter the Krebs cycle.

They will undergo the process of fermentation.

They will move directly to the electron transport chain.

Answer 1

likelihood is, you've already experienced what happens firsthand.
have you ever exercised vigorously and started to feel sore in your body?
in humans, pyruvate is converted into lactic acid instead of forming Acetyl-CoA and following into the tricarboxylic cycle (Krebs Cycle). it's called anaerobic respiration.
here, 2 ATP are made per glucose molecule.
since lactic acid still has much energy left to be extracted, it is transported to the liver and converted back into pyruvate.

Answer 2

so its c? or a?

Answer 3

It be A.

Answer 4

A

Answer 5

that was wrong