Question

Uncouples such as $2,4$-dinitrophenol have no effect on __________________.

• A. Oxidative phosphorylation
• B. Photophosphorylation
• C. Substrate-level phosphorylation
• D. Respiratory-chain phosphorylation

Answer 1

The correct option is C Substrate-level phosphorylation

C. Substrate-level phosphorylation

Solution : Mitochondrial uncouplers, such as 2,4 dinitrophenol (DNP), increase the cellular respiration by decreasing mitochondrial membrane potential but have no effect on substrate level phosphorylation or reactions where ATP is formed by help of substrates reaction.

So the correct answer is "Substrate-level phosphorylation".