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Question

According to new studies one molecule of NADH releases 2.5 ATPs and one molecule of FADH2 releases 1.5 ATPs, then the number of equivalent ATPs generated in ETC from 1 molecule of acetyl CoA is

A
10
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B
12
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C
12.5
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D
15
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Solution

The correct option is A 10
From 1 molecule of acetyl CoA, 3 molecules of NADH and 1 molecule of FADH2 is generated and 1 molecule of ATP is also generated through substrate level phosphorylation.

1 Acetyl CoA = 3 NADH + 1 FADH2 + 1 ATP
= 3×2.5 ATP + 1×1.5 ATP + 1 ATP
= 7.5 ATP + 1.5 ATP + 1 ATP
= 10 ATP

Hence, the number of equivalent ATPs generated in ETC from 1 molecule of acetyl CoA is 10 ATPs.

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