What does the light-harvesting complex of a photosystem do?
AIt pumps protons out of the thylakoid lumen
BIt joins carbon dioxide to a five-carbon sugar
CIt passes energy from sunlight to the reaction centre
DIt carries electrons from water to the reaction centre
Answer & Solution
Correct answer: C. It passes energy from sunlight to the reaction centre
1. Each photosystem is serviced by a light-harvesting complex.
2. That complex passes energy from sunlight to the reaction centre.
3. It consists of multiple antenna proteins holding a mixture of chlorophyll a and b molecules and other pigments.
4. Only energy moves at this stage, so a complex that carried electrons would be describing a later step.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 8 "Photosynthesis", section 8.2 The Light-Dependent Reactions of Photosynthesis_
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