Which term describes ATP production resulting from the capture of light energy by chlorophyll?
A: Substrate-level phosphorylation
D: Oxidative phosphorylation
The correct answer is option B.
Photophosphorylation is the best term that describes ATP production resulting from the capture of light energy by chlorophyll.
“Photophosphorylation is the process of utilizing light energy from photosynthesis to convert ADP to ATP”.
It is the process in which energy-rich ATP molecules are formed by transferring the phosphate group into the ADP molecule in the presence of sunlight.
There are two types of photophosphorylation;
- Cyclic Photophosphorylation
- Non-cyclic Photophosphorylation
1: Cyclic Photophosphorylation:
The type of photophosphorylation process resulting in the movement of electrons for the synthesis of ATP molecules in a cyclic manner.
In this process, plant cells convert ADP to ATP molecules for the immediate energy for the use of cells. This process occurs in the thylakoid membrane. It uses the chlorophyll P700 and photosystem I.
During this process, the electrons are transferred back to P700 instead of transferring it to the NADP from the electron acceptor. This downward movement of electrons from an acceptor to P700 results in the formation of ATP molecules.
2: Non-cyclic photophosphorylation:
The type of photophosphorylation process which results in the movement of the electrons for the synthesis of ATP molecules using the energy in a non-cyclic manner.
It is referred to as non- cyclic photophosphorylation because the lost electrons by P680 of Photosystem II are occupied by P700 of Photosystem I and are not directed back to P680. In this process, the whole movement of the electrons occurs in a unidirectional or a non- cyclic manner.