Question

Arrange the intermediate compounds of Kreb's cycle based on number of carbons in ascending order.

• A. α-Ketoglutaric acid, Acetyl CoA, Citric acid
• B. Acetyl CoA, Citric acid, α-Ketoglutaric acid
• C. α-Ketoglutaric acid, Citric acid, Acetyl CoA
• D. Acetyl CoA, α-Ketoglutaric acid, Citric acid

Hint:

For Kreb's cycle questions, memorize the number of carbons in each intermediate to solve sequence-based questions quickly.

Answer 1

The Correct Option is D

Carbon count of key Krebs cycle compounds:

• Acetyl CoA: 2-carbon molecule
• \(\alpha\)-Ketoglutaric acid: 5-carbon compound
• Citric acid: 6-carbon compound

Therefore, ascending order by carbon number is: Acetyl CoA \(<\) \(\alpha\)-Ketoglutaric acid \(<\) Citric acid