STANDARDBotany-Respiration in Plants

STANDARD Botany Krebs Cycle MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Which of these steps in Kreb's cycle indicates substrate level phosphorylation

A

Conversion of succinic acid to α-ketoglutaric acid

B

Conversion of succinic acid to malic acid

C

Conversion of succinyl CoA to succinic acid

D

Conversion of malic acid to oxalo acetic acid

Correct Answer

Option C

Detailed Explanation

Succinate thiokinase catalyzes the conversion of succinyl CoA to succinic acid. During this step, CoA is released and one molecule of GTP is formed from GDP. This is a substrate level phosphorylation. GTP is converted to GDP with the simultaneous synthesis of ATP from GDP.

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