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Which One Of The Following Is The Correct Sequence Of Stages In Cellular Respiration ?

Incomplete Kreb’s Cycle is the first stage of cellular respiration. This stage takes place in the mitochondria. In this stage, glucose is broken down into pyruvate by the enzyme glycolysis. Incomplete Kreb’s Cycle takes place in the Mitochondria and has three phases:

Phase 1: The first phase takes place in the cytosol of the cell and is known as glycolysis or Embden-Meyerhof pathway (also called pentose phosphate pathway). This phase converts glucose into two molecules of pyruvate.

Phase 2: The second phase takes place in the matrix of mitochondria and is known as oxidative decarboxylation phase or citric acid cycle (also called tricarboxylic acid cycle). In this phase, two molecules of pyruvate are converted into two molecules of acetyl coenzyme A. It also produces NADH + H+.

Phase 3: The third phase is also known as oxidative phosphorylation phase or electron transport chain. In this phase, electrons are transferred from NADH + H+ to O2 to produce ATP through chemiosmosis process (ATP synthase).

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Last modified: August 11, 2022