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Question
Biology
Posted 9 months ago
During the first steps of photosynthesis, plants convert light energy to another form of potential energy. What is the form of this intermediate potential energy that is then used by the plant cell to directly produce ATP?
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Answer from Sia
Posted 9 months ago
Answer
The form of intermediate potential energy that is then used by the plant cell to directly produce ATP is the proton gradient (H+ gradient) across the thylakoid membrane.
Solution
a
During the first steps of photosynthesis, light energy is absorbed by chlorophyll and other pigments in the thylakoid membranes of the chloroplasts. This energy is used to excite electrons, which are then transferred through a series of proteins in the electron transport chain
b
As electrons move through the electron transport chain, energy is released and used to pump protons (H+) from the stroma into the thylakoid lumen, creating a proton gradient across the thylakoid membrane
c
This proton gradient represents a form of potential energy. The protons flow back into the stroma through ATP synthase, a process known as chemiosmosis. The flow of protons through ATP synthase drives the synthesis of ATP from ADP and inorganic phosphate (Pi)
Key Concept
Proton gradient (H+ gradient)
Explanation
The proton gradient across the thylakoid membrane is the intermediate form of potential energy created during the light-dependent reactions of photosynthesis. This gradient is used to produce ATP through the process of chemiosmosis.

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