Question

The cycle in which pyruvic acid is broken down in the presence of oxygen is known as

• A. Glycolysis
• B. Kreb's cycle
• C. Anaerobic respiration
• D. None of the above

Answer 1

Answer: (B)

Kreb's cycle

Glycolysis is the first step of cellular respiration that breaksdown glucose into two molecules of pyruvic acid independent of presence or absence of oxygen. The pyruvic acid is then decarboxylated into acetyl CoA and enters Kreb cycle where in it is aerobically broken down; the pathway takes place in mitochondrial matrix. Anerobic respiration breaks down pyruvic acid in absence of oxygen into ethanol or lactic acid. Correct answer is B.