Asked Jul 9, 2019

Describe the process of cellular respiration, from the introduction of a glucose molecule into the cytoplasm to the production of the final ATP made from energy contained within that glucose molecule.


Expert Answer

Step 1

Cellular respiration, or aerobic respiration (named so because of the involvement of oxygen), involves the process of production of ATP from a glucose molecule. There are four stages in the process, namely glycolysis, conversion of pyruvate to acetyl CoA (coenzyme A), Kreb’s cycle and electron transport chain.

Step 2

Glycolysis is the first step. It involves the conversion of one glucose molecule to two pyruvate molecules, generating two ATP and two NADH (reduced form of nicotinamide adenine dinucleotide) molecules in the process. The whole process is divided into two stages which are the preparatory phase (where glucose is converted into ‘glyceraldehyde-3-phosphate’) and the pay-off phase (where glyceraldehyde-3-phosphate is converted into pyruvate).  

Step 3

In the second step, pyruvate is converted into acetyl CoA, which goes into the TCA (tricarboxylic acid) cycle. The reaction is catalysed by the e...

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