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Question

Respiration and photosynthesis both require

A
Green cells
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B
Sunlight
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C
Cytochromes
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D
Organic fuel
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Solution

The correct option is C Cytochromes
Both respiration and photosynthesis involve electron transfer across a series of electron carriers embedded in the inner mitochondrial membrane and the thylakoid membranes respectively. Cytochromes are responsible for ATP production through electron transport and are iron-containing proteins. They catalyze redox reactions and the heme group interconverts between oxidation states Fe2+ (reduced) and Fe3+ (oxidized) states.

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