Multiple choice

Enzymes of electron transport system are present in

  1. inner mitochondrial membrane

  2. matrix

  3. intermembranous space

  4. endoplasmic reticulum

  5. -
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A Correct answer
Explanation

An electron transport chain (ETC) is a series of compounds that transfer electrons from electron donors to electron acceptors via redox (both reduction and oxidation occurring simultaneously) reactions and couple this electron transfer with the transfer of protons (H+ ions) across a membrane. Its enzymes are bound to inner mitochondrial membrane.

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