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PinkMonkey Online Study Guide-Biology

Structure of cristae membrane: The inner surface of the cristae membrane (i.e. the surface towards the matrix) is covered with numerous (infinite) stalked particles. These are called F1 particles, elementary particles or sub units. These particles project into the matrix. Each F1 particle has three parts, viz., the head piece, the stalk and the base piece. The respiratory chain is situated in the cristae membrane where the F1 particles are present. The chain consists of enzymes and co-enzymes which form the electron transport system (ETS) in the mitochondrion. These enzymes and co-enzymes of the ETS act as the electron acceptors in the aerobic respiration reactions oxidative phosphorylation).

Functions of mitochondria

(1) These are the sites of the phase-II reactions of aerobic respiration.

(2) Kreb’s cycle reaction takes place in the matrix.

(3) Terminal oxidation (utilization of O2 and formation of water) and oxidative phosphorylation (formation of ATP) take place in cristae membrane.

(4)ATP molecules formed in aerobic respiration are stored in mitochondria and are supplied for cellular activities. Hence, mitochondria are the energy supplying power houses of cells.

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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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