Join thousands of students who trust us to help them ace their exams!Watch the first video
Multiple Choice
How is ATP produced during the light reaction of photosynthesis?
A
By chemiosmosis in the stroma
B
Through oxidative phosphorylation in the mitochondria
C
By substrate-level phosphorylation in the cytoplasm
D
Through photophosphorylation in the thylakoid membrane
Verified step by step guidance
1
Understand that the light reactions of photosynthesis occur in the thylakoid membranes of chloroplasts.
Recognize that ATP production in the light reactions is driven by a process called photophosphorylation.
Photophosphorylation involves the absorption of light by chlorophyll, which excites electrons to a higher energy state.
These high-energy electrons are transferred through a series of proteins in the thylakoid membrane, known as the electron transport chain.
As electrons move through the chain, protons (H⁺ ions) are pumped into the thylakoid lumen, creating a proton gradient. ATP synthase uses this gradient to synthesize ATP from ADP and inorganic phosphate (Pi) in the stroma.