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

AP Biologyhardmcq1 pt

In C4 plants, carbon fixation is spatially separated from the Calvin cycle to

A.concentrate CO₂ where RuBisCO works and reduce photorespiration

B.produce oxygen at night

C.avoid using ATP in the Calvin cycle

D.store sugar in the thylakoids

Explanation

Core Concept

PEP carboxylase fixes CO₂ in mesophyll cells; the 4-carbon acid releases it in bundle-sheath cells, keeping RuBisCO's local CO₂ high in hot, dry climates.

Correct Answer

Aconcentrate CO₂ where RuBisCO works and reduce photorespiration

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