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Question

Oxidative phosphorylation occurs in:


A

The outer membrane of mitochondria

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B

The inner membrane of mitochondria

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C

Stroma of chloroplast

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D

Grana of chloroplast

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Solution

The correct option is B

The inner membrane of mitochondria


The correct option is B.

Explanation of the correct answer:

  1. Oxidative phosphorylation is the process of ATP synthesis by the movement of electrons.
  2. It is the final step in cellular respiration.
  3. It occurs in the inner mitochondrial membrane.

Explanation of the incorrect options:

Option A:

  1. The outer membrane of mitochondria separates the cytosol from the space within the membrane.
  2. It facilitates the exchange of cations, metabolites, and information between cells and mitochondria.

Option C:

  1. The stroma of chloroplasts is the space inside bound by the inner membrane.
  2. It contains enzymes that facilitate the synthesis of carbohydrates and proteins.

Option D:

  1. A stack of grana forms a thylakoid in the stroma.
  2. In the grana light reactions of photosynthesis take place.

Final answer: Oxidative phosphorylation occurs in the inner membrane of mitochondria.


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