Apentix/AP Biology/Unit 2: Cell Structure and Function/Question

AP Biologyeasymcq1 pt

In a leaf mesophyll cell, where do the light-dependent reactions of photosynthesis occur?

A.In the stroma surrounding the thylakoids

B.Across the inner mitochondrial membrane

C.In the thylakoid membranes of the chloroplast

D.On the nuclear envelope next to chloroplasts

Explanation

Core Concept

Thylakoid membranes embed photosystems I and II, the cytochrome b6f complex, and ATP synthase, the machinery that absorbs light, splits water, and passes electrons down a transport chain. Protons accumulate in the thylakoid lumen during these reactions, powering ATP and NADPH formation. The Calvin cycle then consumes those products in the surrounding stroma, which contains no photosystems.

Correct Answer

CIn the thylakoid membranes of the chloroplast

More Unit 2: Cell Structure and Function practice questions

Try a random question →

Practice more AP Biology questions with full explanations

Practice Unit 2: Cell Structure and Function Questions →