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PinkMonkey Online Study Guide-Biology

Anaerobic respiration : An intracellular-oxidation of organic substrate (e.g. glucose) without utilization of free molecular oxygen (in the absence of oxygen). The oxidation is incomplete and results in the formation of either ethyl alcohol or lactic acid, carbon dioxide and energy (2#ATP).

Important features

  1. Complete process of anaerobic respiration takes place in the cell cytoplasm only.

  2. Mitochondria are not involved.
  3. Oxygen is not used.
  4. Kreb’s cycle reactions, ETS or oxidative phosphorylation are not involved.
  5. Phase-I consists of the same reactions of glycolysis (EMP pathway). found in aerobic respiration .
  6. Phase-II consists of decarboxylation and reduction reactions converting the pyruvic acid into either ethyl alcohol with the evolution of Carbon Dioxide.

The whole process may be summarized as follows :


Further anaerobic breakdown of pyruvic acid involves following two steps.

After adding up the equations (1) + (2) + (3), the final overall equation for the anaerobic respiration is obtained as follows:

The 2 NADH2 gained in glycolysis are used in the reduction of acetaldehyde to ethanol.

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Table of Contents

5.0 - Introduction
5.1 - Ultrastructure and Functions of Mitochondrion
5.2 - An Overview of Cellular Respiration
5.3 - Glycolysis
5.4 - The T.C.A. Cycle(Tricarboxylic Acid Cycle)
5.5 - Electron Transport Chain
5.6 - Fermentation
5.7 - Significance of Respiration

Chapter 6


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