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Question

What is the correct order of cellular respiration?

A
Krebs cycle – Electron transport chain – Glycolysis
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B
Electron transport chain – Krebs cycle – Glycolysis
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C
Glycolysis – Krebs cycle – Electron transport chain
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D
Glycolysis – Electron transport chain – Krebs cycle
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Solution

The correct option is C Glycolysis – Krebs cycle – Electron transport chain

Cellular Respiration is the process in which energy stored in a glucose molecule is released by oxidation. Hydrogen atoms are lost by glucose and gained by oxygen. Cellular respiration begins with glycolysis in the cytoplasm, the glycolytic product then enters the Kreb's cycle and the electrons produced by the breakdown of these products is stored in an electron acceptor as NADH. The NADH formed is then channelled into the ETC to produce a chemiosmotic gradient, that drives the formation of ATP.
Therefore the correct order is Glycolysis ----------> Kreb's cycle ------> ETC


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