Which of the following will not have cell wall?
Correct Answer: Protozoa
Description: Ans: c (Protozoa) Ref: Ananthanarayan,7th ed, p. 7Protozoa doesn't have cell wall. The typical protozoan cell is bounded by a trilaminar unit membrane, supported by a sheet of contractile fibrils which enable the cell to change its shape and to move.Cell wall of prokaryotes contains muramic acid and peptidoglycans while cell wall of eukaryotes contain sterols.Prokaryotes are devoid of membrane bound organelles.Other features:Nucleus:Devoid of nuclear membrane and nucleolusThey do not contain deoxyribonucleoproteins that is their nucleic acid DNA is not associated with basic protein histoneThe genome consists of a single molecule double stranded DNA arranged in the form of a circle.Mitotic division does not occur and these divide by binary fission.Cytoplasm:It differs from eukaryotic cytoplasm in not exhibiting protoplasmic streaming.Mitochondria, endoplasmic reticulum, lysosomes and Golgi apparatus are all absent.
Category:
Microbiology
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