ATP Synthase Structure & Function — NEET Biology
📚 Practice ConceptThe ATP synthase enzyme consists of two parts: one called the CF₀ is embedded in the thylakoid membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane. The other portion is called CF₁ and protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma. The break down of the gradient provides enough energy to cause a conformational change in the CF₁ particle of the ATP synthase, which makes the enzyme synthesise several molecules of energy-packed ATP.
Assertion (A): ATP synthase produces multiple ATP molecules during photosynthesis. Reason (R): The breakdown of the proton gradient causes conformational change in CF1 particle of ATP synthase, enabling the enzyme to synthesize energy-packed ATP.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
NCERT confirms ATP synthase produces multiple ATP molecules (Assertion true). NCERT states “The break down of the gradient provides enough energy to cause a conformational change in the CF1 particle of the ATP synthase, which makes the enzyme synthesise several molecules of energy-packed ATP” - the Reason explains the MECHANISM of ATP synthesis (gradient breakdown → conformational change → ATP synthesis). Both are true and Reason explains HOW ATP synthesis occurs.
What does NCERT say about ATP synthase enzyme consists?
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.