A phosphate group is transferred from an organic compound to ADP during
A) oxidative phosphorylation.
B) substrate-level phosphorylation.
C) beta-oxidation.
D) photophosphorylation.
E) anabolic reactions.

Question

Quizplus · Accepted Answer

Substrate-level phosphorylation is the process by which a phosphate group is directly transferred from a substrate molecule to ADP to form ATP. This occurs during metabolic reactions in the cytoplasm that generate ATP without the involvement of the electron transport chain or a proton gradient, as in oxidative phosphorylation. Beta-oxidation is the breakdown of fatty acids for energy, and does not involve the direct transfer of a phosphate group to ADP. Photophosphorylation refers to the production of ATP during photosynthesis, which involves the transfer of electrons from chlorophyll to an electron transport chain, ultimately driving ATP synthesis. Anabolic reactions involve the synthesis of complex molecules from smaller building blocks, and do not involve ATP synthesis.

A Phosphate Group Is Transferred from an Organic Compound to ADP