Question
Biology Question on respiration in plants
Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.
A
Malic acid→ Oxaloacetic acid
B
Succinic acid→ Malic acid
C
Succinyl-CoA→Succinic acid
D
Isocitrate→α-ketoglutaric acid
Answer
Succinyl-CoA→Succinic acid
Explanation
Solution
In the tricarboxylic acid cycle, the conversion of Succinyl-CoA to succinic acid does not involve oxidation but is instead a substrate-level phosphorylation.
In contrast, the conversion of isocitrate to-ketoglutarate and malate to oxaloacetate both involve oxidation reactions.