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Photosynthesis in Higher Plants
Photophosphorylation
1 question from 1 paper, each with its answer.
- question
- 1
- paper
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- of Photosynthesis in Higher Plants
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Concepts tested
- ATP synthesis using light energy
All Questions
2003 AIPMT 1 question
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Which one of the following concerns photophosphorylation : -Photophosphorylation is the synthesis of ATP from ADP and inorganic phosphate in chloroplasts, using the energy of light.
Light drives electron transport in the thylakoid membrane, which builds a proton gradient; ATP synthase uses this gradient to make ATP (chemiosmosis):
$ADP + P_i \xrightarrow{light\ energy} ATP$
The same reaction without light refers to oxidative or substrate-level phosphorylation. AMP is not the substrate of photophosphorylation.
So photophosphorylation is $ADP$ + inorganic $PO_4$ $\xrightarrow{light\ energy}$ ATP.