The Citric Acid Cycle (Krebs cycle) involves several organic acids with different carbon numbers. The key acids with 4, 5, and 6 carbons are:
Succinic acid (4C) - A 4-carbon intermediate formed after the decarboxylation of α-Ketoglutaric acid.
α-Ketoglutaric acid (5C) - A 5-carbon compound that undergoes oxidative decarboxylation to form Succinyl-CoA.
Citric acid (6C) - The 6-carbon compound formed initially by the condensation of oxaloacetate and acetyl-CoA.
Thus, the correct answer is (D) Succinic acid, α-Ketoglutaric acid and Citric acid, as these represent the 4C, 5C, and 6C acids respectively in the Citric Acid Cycle.
List I | List II | ||
A. | Oxidative decarboxylation | I. | Citrate synthase |
B. | Glycolysis | II. | Pyruvate dehydrogenase |
C. | Oxidative phosphorylation | III. | Electron transport system |
D. | Tricarboxylic acid cycle | IV. | EMP pathway |
It is the release of a relatively large amount of energy in cells by the breakdown of food substances in the presence of oxygen:
Glucose + Oxygen → Carbon Dioxide + Water.