Oxidative phosphorylation is

MCQ

A
formation of $ATP$ by transfer of phosphate group from a substrate to $ADP$
B
oxidation of phosphate group in $ATP$
C
addition of phosphate group to $ATP$
✓
formation of $ATP$ by energy released from electrons removed during substrate oxidation.

✓

Answer

Correct option: D.

formation of $ATP$ by energy released from electrons removed during substrate oxidation.

d
(d) : Oxidative phosphorylation is the synthesis of energy rich $ATP$ molecules with the help of energy liberated during oxidation of reduced coenzymes $(NADH, FADH_2)$ produced in respiration.The enzyme required for this synthesis is called $ATP$ synthase. It is located in $F_1$ or head piece of $F_0 -F_1$ or elementary particles present in the inner mitochondrial membrane. $F_1$ particle is capable of $ATP$ synthesis. $ATP$ synthase becomes active in $ATP$ formation only when there is a proton gradient having higher concentration of $H^+$ or protons on the $F_0$ side as compared to $F_1$ side.This higher concentration creates an electric potential across the mitochondrial membrane. The proton gradient and membrane electric potential together form proton motive force $(PMF)$. The flow of protons through the $F_0$ channel which induces $F_1$ particle to function as $ATP$ synthase. The energy of the proton gradient is used in attaching a phosphate radicle to $ADP$ by highenergy bond. This produces $ATP.$

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