Which region of a chloroplast captures light energy?

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Prepare for the Biology Test on Energy, Enzymes, Cellular Respiration, Photosynthesis, and Metabolic Pathways with flashcards and multiple-choice questions. Gain insights with detailed hints and explanations to excel in your exam.

Multiple Choice

Which region of a chloroplast captures light energy?

Explanation:
Light energy capture happens in the thylakoid membrane, the internal membrane system of the chloroplast. This membrane hosts chlorophyll and other pigments arranged into photosystems that absorb light, excite electrons, and drive the electron transport chain. The resulting energy transfer creates a proton gradient across the membrane, powering ATP synthase to make ATP, and also enables NADP+ reduction to NADPH. The stroma is the surrounding fluid where the Calvin cycle uses those energy carriers to fix carbon. The outer membrane is simply a boundary, and chloroplast DNA stores genetic information rather than participating in light capture.

Light energy capture happens in the thylakoid membrane, the internal membrane system of the chloroplast. This membrane hosts chlorophyll and other pigments arranged into photosystems that absorb light, excite electrons, and drive the electron transport chain. The resulting energy transfer creates a proton gradient across the membrane, powering ATP synthase to make ATP, and also enables NADP+ reduction to NADPH. The stroma is the surrounding fluid where the Calvin cycle uses those energy carriers to fix carbon. The outer membrane is simply a boundary, and chloroplast DNA stores genetic information rather than participating in light capture.

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