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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All are membrane bounded cell organelles except
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Q4
Assertion :The cells that have membrane bound organelles are called eukaryotic. Reason: The cells that lack membrane bound organelles are called prokaryotic.