Question

The excess energy of electron is used in the synthesis of ATP and the process is called

• A. Oxidative phosphorylation
• B. Substrate phosphorylation
• C. Photophosphorylation
• D. Phosphorylation

Answer 1

The correct option is C Photophosphorylation

The excess energy of electron is used in the synthesis of ATP and the process is called phosphorylation. It is an enzymatic process in which a phosphate group is transferred from one molecule to a protein. It is usually done within a biological system. Any protein after being phosphorylated is used as energy currency in the process of photosynthesis. Phosphorylation is of three types:-

1. Oxidative phosphorylation - In this type of phosphorylation, downward flow of electrons is used to pump hydrogen ions uphill.
2. Substrate phosphorylation - In this type of phosphorylation, the transfer of inorganic phosphate is done via a donor molecule called guanosine triphosphate (GTP) to ADP in order to form ATP
3. Photophosphorylation - In this type of phosphorylation, synthesis of ATP is done with the help of light.