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Question

The smallest living cells with cell wall are _______.
  1. Viroids
  2. Algae
  3. Bacteria
  4. Mycoplasma

A
Viroids
B
Mycoplasma
C
Algae
D
Bacteria
Solution
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Algae are the living cells which, have a cell wall composed of either polysaccharide (such as cellulose (a glucan)) or a variety of glycoproteins. But they are larger in size as compared to the bacterial cell.
Bacteria is a unicellular prokaryotic organism possess prominent cell wall made up of peptidoglycans.

Viroids consist solely of short strands of circular, single-stranded RNA without protein coats, it lacks a cell wall.

Mycoplasma has plasma membrane as the outermost covering, it lacks a cell wall. So, the correct answer is 'Bacteria'.

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