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Question

Biology Question on Fermentation

How many ATP molecules are obtained from fermentation of 1 molecule of glucose?

A

2

B

4

C

3

D

5

Answer

2

Explanation

Solution

During alcoholic fermentation of glucose molecule, pyruvic add is first decarboxylated to form acetaldehyde and CO2,C{{O}_{2}}, which is then changed to ethyl alcohol with the help of NADH. Net gain is 2ATP molecules per glucose molecule. C6H12O6+ 2ADP + 2Pi→2C2H5OH Glucos⁡e Ethyl alcohol + 2CO2 + 2ATP + 2H2O \begin{aligned} & {{C}_{6}}{{H}_{12}}{{O}_{6}}+\,2ADP\,+\,2Pi\xrightarrow[{}]{{}}2{{C}_{2}}{{H}_{5}}OH \\\ & Glu\cos e\,Ethyl\,alcohol \\\ & +\,2C{{O}_{2}}\,+\,2ATP\,+\,2{{H}_{2}}O \\\ \end{aligned}