Question

The process of photophosphorylation was discovered by ____
(a) Calvin
(b) Arnon
(c) Priestley
(d) Warburg

Answer 1

Photophosphorylation (The formation of ATP from ADP and Pi in presence of light) was discovered by Daniel Arnon in chloroplast.

Complete answer: Process by which ATP is synthesized by cells (in mitochondria and chloroplasts) is called phosphorylation. Photophosphorylation is the synthesis of ATP from ADP and inorganic phosphate in presence of light.

Photophosphorylation was discovered by Arnon. Depending on the path of electrons in the electron transport system, two types of photophosphorylation occurs: Cyclic and non-cyclic photophosphorylation.
Cyclic photophosphorylation occurs within the lamellae of the chloroplast; Where synthesis of ATP coupled to ETC activated by PS I solely; whereas non-cyclic photophosphorylation occurs in thylakoid membrane. Here, the electrons move in a non-cyclic manner for synthesizing ATP molecules from PSII.

Thus, the right answer is ‘Arnon’.

Note: Later, A. Frenkel detected the light-dependent ATP production in bacterial chromatophores.
Calvin discovered Calvin cycle; a light-dependent photosynthetic reaction.
Joseph Priestley discovered Oxygen in 1774
In oncology, the Warburg effect was postulated by Warburg, stating that cancer cells predominantly produce energy by high rate of glycolysis followed by lactic acid fermentation in cytosol.