Question

1.
Oxygen becomes part of cellular respiration _________________.

at the end of glycolysis

at the end of fermentation

at the end of the electron transport chain

at the end of the Krebs cycle
2.
Glycolysis takes place before fermentation.

True

False
3.
Before entering the Krebs cycle, an intermediate molecule bonds to a 2-carbon molecule. This intermediate complex enters the Krebs cycle and combines with a 4-carbon molecule to form citric acid. The name of this molecule is ____________________.

ATP synthase

citrase

FADH2

coenzyme A

Answer 1

1. at the end of the electron transport chain, it gets reduced to water by the transported electrons and ATP is produced :)
2. true, glycolysis is the first step in the suger catabolism, fermentation is the anaerobic way to recover NAD+
3. before the crebs cycle the pyruvate formed in the glycolysis is first decarboxylated (CO2 is built as a waste product) and then attached to the coenzyme A to form Acetyl-CoA, which enters the citric acid cycle :)