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27/08/2020 5:52 pm
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Which one of the following statements is correct?
(a) Prions are the smallest free-living cells.
(b) The cell wall of Mycoplasmas is made up of amino sugars.
(c) Viroids consist of single-stranded RNA molecule.
(d) Rickettsiae lack cell wall.
1 Answer
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27/08/2020 5:56 pm
(c) Viroids consist of single-stranded RNA molecule.
Explanation:
Viroid is a small infective segment of nucleic acid, usually RNA. Prion is an infectious pathogenic agent devoid of nucleic acid and composed mainly of proteins. Mycoplasmas lack a cell wall while Rickettsiae possess a cell wall.