This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Chain, Subject name: Biochemistry
Substrate level phosphorylation in glycolysis is seen in - 
Select and explain. 
A. Pyruvate kinase, B. Succinatethiokinase, C. Enolase, D. PDH
A: Pyruvate kinase
Answer: A: Pyruvate kinase 
Explanation: Ans. is 'a' i.e.. Pyruvate kinase o Amongst the given options, two enzymes induce substrate level phosphorylation :Pyruvate kinase - in glycolysisSuccinate thiokinase - in TCA cycleo Succinyl-CoA is converted to succinate by the enzyme succinate thiokinase (succinyl-CoA synthetase). This is the only example in the citric acid cycle of substrate level phosphorylation.