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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