Discussion
What is the primary function of the citric acid cycle (Krebs' Cycle) in cellular respiration ?
Answer: A
The key gives production of ATP.
The citric acid (Krebs) cycle, in the mitochondria, oxidises acetyl-CoA to carbon dioxide. Each turn yields one ATP (or GTP) directly and, more importantly, the reduced carriers NADH and FADH2, which drive the electron transport chain to make most of the ATP of aerobic respiration. Its role in respiration is thus to release energy for ATP production.
Glucose itself is broken down first in glycolysis, protein synthesis takes place on ribosomes, and fatty acids are broken down by beta-oxidation before entering the cycle as acetyl-CoA.
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