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Question

All are membrane bound cell organelles except

A
Mitochondria
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B
Lysosomes
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C
Spherosomes
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D
Ribosomes
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Solution

The correct option is D Ribosomes
  • The limiting membrane of cells and cellular organelles which is composed of 3-layered structure- an inner lipid layer and two outer protein layers.
  • This unit membrane surrounds most of the cellular organelles (Golgi apparatus, microbody, lysosomes etc.).
  • Ribosomes are non-membranous cellular organelle thus, it lacks a unit membrane,
  • So, the correct answer is 'Ribosome'.

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