Apentix/AP Biology/Unit 3: Cellular Energetics/Question
AP Biologyeasymcq1 pt

Within a chloroplast, where are the light-dependent reactions and the Calvin cycle respectively located?

A.Light-dependent reactions in the stroma, Calvin cycle in the thylakoid lumen
B.Both stages occur together in the outer envelope membrane
C.Light-dependent reactions embedded in thylakoid membranes, Calvin cycle dissolved in the stroma
D.Calvin cycle inside the lumen, where stored protons energize Rubisco

Explanation

Core Concept

Thylakoid membranes hold the photosystems, cytochrome b6f, and ATP synthase in ordered arrays, ideal for shuttling electrons and trapping protons in the narrow lumen. The stroma surrounding them contains Rubisco and the soluble enzymes handling G3P and RuBP. Physical separation lets the membranes harvest light energy while the fluid phase spends that currency on carbon fixation.

Correct Answer

CLight-dependent reactions embedded in thylakoid membranes, Calvin cycle dissolved in the stroma

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