Multiple choice

Substrate phosphorylation occurs when

  1. Citric Acid changes into Cis Aconotic acid

  2. Malic acid changes into Oxalo Acetic Acid

  3. Fumaric acid changes into Malic Acid

  4. Succinyl Co A changes into Succinic Acid

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D Correct answer
Explanation

Substrate-level phosphorylation occurs when a high-energy phosphate bond is transferred directly to ADP or GDP. The conversion of Succinyl-CoA to Succinic acid by Succinyl-CoA synthetase is a classic example of this.