A) oxaloacetic acid to citric acid
B) succinyl Co-A to succinic acid
C) succinic acid to fumaric acid
D) fumaric acid to malic acid
Correct Answer: B
Solution :
Tricarboxylic acid cycle or citric acid cycle or Krebs cycle takes place in matrix of mitochondria. Acetyl coenzyme-A is connecting link between cycle and EMP pathway, while oxaloacetate is acceptor molecule. Substrate level phosphorylation takes place during the conversion of succinyl Co-A to succinic acid, Succinyl Co-A + ADP +\[{{H}_{3}}P{{O}_{4}}\xrightarrow[Co-A\,synthetase]{Succinyl}\] succinic acid + ATP + Co-A
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