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Question

Outer and inner membranes of mitochondria are


A
Structurally and functionally similar
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B
Structurally and functionally dissimilar
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C
Structurally similar but functionally different
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D
Structurally different but functionally similar
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Solution

The correct option is A Structurally and functionally dissimilar
  • The mitochondria is a double-membraned cell organelle, known as the powerhouse of the cell which is present in all eukaryotic cells.
  • It has an outer membrane and an inner membrane.
1) The inner mitochondrial membrane has folds called cristae which helps in increasing the surface area.
  • The enzyme ATP synthase is embedded in the inner mitochondrial membrane helps in the synthesis of ATP molecule (energy currency of the cell).
  • It is also the site of the electron transport chain (aerobic respiration).
2) The outer mitochondria membrane is a phospholipid bilayer embedded with integral proteins.
  • This layer contains porins that allow the movement of molecules across them(10,000 Daltons or less).
  •  It is permeable to water, ions and few proteins to move freely into the inter mitochondrial space.
  • So, the correct answer is 'Structurally and functionally dissimilar'.

Biology

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