Question

ATP synthesis in cell requires

• A. $H^{+}$ gradient across the membrane
• B. $K^{+}$ gradient across the membrane
• C. $P{O}_4^{3-}$ gradient across the membrane
• D. $C{a}^{2+}$ gradient across the membrane

Answer 1

The correct option is A $H^{+}$ gradient across the membrane

A) A $H^{+}$ gradient or proton pump is developed in the lumen of the thylakoid which helps in ATP synthesis.

B) $K^{+}$ does not play a role in ATP synthesis.

C) ${PO}_4^{3-}$ does not play a role in ATP synthesis.

D) ${Ca}^{2+}$ is involved in the photolysis of water.

So the correct answer is '$H^{+}$ gradient across the membrane'.