Question

Which one is photophosphorylation?

• A. ADP + AMP $\stackrel{Lightenergy}{⟶}$ ATP
• B. ADP + Inorganic phosphate $\stackrel{Lightenergy}{⟶}$ ATP
• C. ADP + Inorganic PO${}_4$ $⟶$ ATP
• D. AMP + Inorganic PO${}_4$ $\stackrel{Lightenergy}{⟶}$ ATP

Answer 1

The correct option is B ADP + Inorganic phosphate $\stackrel{Lightenergy}{⟶}$ ATP

Photosynthetic phosphorylation or photophosphorylation is the process of phosphate group transfer into ADP to synthesize energy-rich ATP molecules making use of light as the external energy source.

It occurs at thylakoid locule to the stroma through ATPase complex due to pH gradient across the membrane. It is believed that single ATP is formed from ADP and Pi( inorganic phosphate) when 3H${}^{+}$ pass through ATPase complex.

ADP + Inorganic phosphate$\stackrel{Lightenergy}{⟶}$ ATP.

Hence, the correct answer is 'ADP + Inorganic phosphate$\stackrel{Lightenergy}{⟶}$ ATP'.