Cell wall is absent in which one of the following organisms ?

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Bacteria

Diatom

Mushroom

Tapeworm

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This question was previously asked in

UPSC CDS-2 – 2023

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A cell wall is a rigid layer found outside the plasma membrane of cells in plants, fungi, bacteria, algae, and some archaea. It provides structural support, protection, and helps maintain cell shape. Animal cells, however, do not have cell walls; they are surrounded only by a flexible cell membrane.

Let’s check the presence of cell walls in the given organisms:
A) Bacteria have cell walls typically made of peptidoglycan.
B) Diatoms are a type of algae belonging to Protista; they have unique cell walls made of silica, called frustules.
C) Mushrooms are fungi; fungal cells have cell walls made primarily of chitin.
D) Tapeworms are multicellular animals (Platyhelminthes). Animal cells characteristically lack cell walls.

The absence of a cell wall in animal cells allows for greater flexibility and motility compared to cells with rigid cell walls. It also facilitates processes like phagocytosis and tissue formation.

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