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STD 11 - 2. Biology classification — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 2. Biology classification1 Mark
MCQ
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
  • ✓
    Viroids consist of single-stranded $RNA$ molecule.
  • D
    Rickettsiae lack cell wall.
✓

Answer

Correct option: C.
Viroids consist of single-stranded $RNA$ molecule.
c
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.

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