BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The stages of cellular respiration include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation .

Detailed explanation-2: -There are three main steps of cellular respiration: glycolysis; the citric acid (TCA) or the Krebs cycle; and the electron transport chain, where oxidative phosphorylation occurs.

Detailed explanation-3: -In general, the main energy source for cellular metabolism is glucose, which is catabolized in the three subsequent processes-glycolysis, tricarboxylic acid cycle (TCA or Krebs cycle), and finally oxidative phosphorylation-to produce ATP.

Detailed explanation-4: -Glycolysis is the metabolic pathway that converts glucose into pyruvate. The free energy released during the biochemical reactions in glycolysis is used to generate a net gain of two molecules of ATP.