Question

ATP formation during photosynthesis is known as

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

Answer 1

Answer: (B)

Photophosphorylation.

Photophosphorylation refers to the use of light energy from photosynthesis to ultimately provide the energy to convert ADP to ATP, thus replenishing the universal energy currency in living things.

Phosphorylation is the addition of a phosphate (PO43−) group to a protein or other organic molecule.

Oxidative phosphorylation (or OXPHOS in short) is the metabolic pathway in which the mitochondria in cells use their structure, enzymes, and energy released by the oxidation of nutrients to reform ATP.

Substrate-level phosphorylation is a type of metabolic reaction that results in the formation of adenosine triphosphate (ATP) or guanosine triphosphate (GTP) by the direct transfer and donation of a phosphoryl (PO3) group to adenosine diphosphate (ADP) or guanosine diphosphate (GDP) from a phosphorylated reactive intermediate.

So, the correct answer is option B.