Question

ATP synthesis by ATP synthase is driven by the movement of
A. Protons
B. NADPH
C. Electrons
D. All of the above

Answer 1

Hint:
Before we proceed with the problem, it is important to know about ATP synthesis.
The process of cellular respiration is where ATP is largely produced. The oxidation of respiratory substrates such as proteins, lipids, and carbohydrates produces ATP. Their oxidation generates energy, which is then conserved in ATP as high-energy bonds. ADP and inorganic phosphate (Pi) are used by ATP synthase to create ATP in the F1 sector.

Complete step by step answer:
The mitochondrial enzyme ATP synthase, which is found in the inner membrane, transforms ADP and phosphate into ATP. The flux of protons is driven by the transfer of electrons from the chemically positive to the negative side of the proton, which creates a gradient.
ATP production is fueled by the protons moving across the membrane in a gradient created by the electron transport chain. In addition to the Krebs cycle and glycolysis, this process also takes place during photosynthesis.
In the chloroplast, proton gradients and proton-dependent transport processes take place. For chloroplasts to operate, proton gradients are essential. The light-induced proton gradient is necessary for ATP generation across thylakoid membranes.
The electron transport chain is primarily used to move protons across the membrane and into the inter-membrane gap. A proton-motive force will drive ATP synthase to produce ATP from ADP and a phosphate group during the last phase of cellular respiration.

Option ‘A’ is correct

Note:
Protons are thought to move through a protein pump encased in a lipid bilayer by passing through a specific channel in the protein, much like how electrons move from one amino acid side chain to the next. This proton gradient or gradient of H⁺, flowing through the membrane enzyme complex ATP synthase is the direct energy source for ATP synthesis.