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PinkMonkey Online Study Guide-Biology

The ETS reactions are oxidation-reduction (Redox) reactions. During the transfer of hydrogen/electrons through the chain, each carrier molecule is alternately reduced and oxidized. For example, when a carrier accepts hydrogen/electron it gets reduced. On the other hand, the reduced carrier is oxidized when it transfers the hydrogen/electron to the next carrier in the chain.

There is a net flow of electrons through the ETS from more electronegative redox potential (i.e. from NADH2 or FADH2) to the more electropositive redox potential (i.e. to oxygen).

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Overall result of aerobic respiration

Complete oxidation of one molecule of 6-C glucose through aerobic respiration (involving glycolysis, Kreb’s cycle, ETS, etc.) results in —

(a) release of 6#CO2
(b) Utilization of 6#O2 and
(c) Formation of 6#H2O.

However, 6H2O are used up in Kreb’s cycle (involving 2 pyruvic acid molecules).
\ 12 H2O formed - 6H2O used = 6H2O net gain

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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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