Which process reduces molecular oxygen to water?

A

Krebs cycle

B

Glycolysis

C

Electron transport system

D

Fermentation

Dear student

Electron transport system reduces molecular oxygen to water. 

Electron transport is a series of redox reactions that resemble a relay race. Electrons are passed rapidly from one component to the next to the endpoint of the chain, where the electrons reduce molecular oxygen, producing water.

Pyruvate is needed in order to create acetyl CoA. This is a very short step in between glycolysis and the citric acid cycle. The 3-carbon pyruvate molecule made in glycolysis loses a carbon to produce a new, 2-carbon molecule called acetyl CoA.