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Question

Oxidative phosphorylation is
  1. Addition of phosphate group to ATP
  2. Formation of ATP by transfer of phosphate group from a substrate to ADP
  3. Oxidation of phosphate group in ATP
  4. Formation of ATP by energy released from electrons removed during substrate oxidation


Solution

The correct option is D Formation of ATP by energy released from electrons removed during substrate oxidation
Oxidative phosphorylation is the metabolic pathway in which cells use enzymes to oxidize nutrients, thereby releasing energy which is used to reform ATP.
Phosphorylation is a biochemical process that involves the addition of phosphate to an organic compound. Examples include the addition of phosphate to glucose to produce glucose monophosphate and the addition of phosphate to adenosine diphosphate (ADP) to form adenosine triphosphate (ATP).
Substrate-level phosphorylation is a metabolic reaction that results in the formation of ATP or GTP by the direct transfer of a phosphoryl (PO3) group to ADP or GDP from another phosphorylated compound.

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