Question

The smallest living cells with cell wall are:
A) Mycoplasma
B) Viroids
C) Blue-green Algae
D) Bacteria

Answer 1

Cell is the basic functional, biological and structural unit of all the organisms that are known till date. It is the smallest and fundamental unit of life.

Complete answer:
Let’s discuss given options and find the correct answer:

Option A: Mycoplasma (plural mycoplasmas or mycoplasma) is a genus of bacteria that lack a cell wall around their cell membranes. This characteristic makes them naturally immune to antibiotics that concentrate on cytomembrane synthesis (like the beta-lactam antibiotics). they will be parasitic or saprotrophic. Therefore, this is the incorrect option.
Option B: Viroids are the littlest infectious pathogens renowned. they're composed only of a brief strand of circular, fibre polymer that has no macromolecule coating. All known viroids are inhabitants of upper plants, and most cause diseases. Therefore, this is the incorrect option.
Option C: Cyanobacteria, conjointly referred to as Cyanophyta, is a phylum consisting of nonparasitic chemical change microorganism and also the endosymbiotic plastids. Therefore, this is the incorrect option.
Option D: Bacteria represent an outsized domain of organism microorganisms. Usually a number of micrometres long, microorganisms have a variety of shapes, starting from spheres to rods and spirals. Bacteria have a prominent cell wall and thus, this is the smallest microorganism with a cell wall. Therefore, this is the correct option.

Thus, the correct answer option is (D) Bacteria.

Note: Please read the question properly as it asks for the smallest organism which has a “cell wall” as many can mistake the answer as mycoplasma. Despite the fact that mycoplasma is the smallest cell, it lacks a cell wall, thus making bacteria the correct option.