Identify the statements true for RNA.
(A) RNA acts as a genetic material for some viruses.
(B) RNA also functions as an adapter molecule.
(C) RNA has hexose sugar as its backbone.
(D) RNA also acts as catalyst in some cases.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A), (B) and (D) only
(A) RNA acts as a genetic material for some viruses. — Correct. Viruses such as the tobacco mosaic virus and HIV have RNA as their genetic material.
(B) RNA also functions as an adapter molecule. — Correct. tRNA reads the codon on mRNA and brings the matching amino acid.
(C) RNA has hexose sugar as its backbone. — Incorrect. The sugar of RNA is ribose, a pentose (five-carbon) sugar.
(D) RNA also acts as catalyst in some cases. — Correct. Some reactions are catalysed by RNA; in bacteria the 23S rRNA acts as a ribozyme.
NCERT Extract:
The DNA – “… DNA acts as the genetic material in most of the organisms. RNA though it also acts as a genetic material in some viruses, mostly functions as a messenger. RNA has additional roles as well. It functions as adapter, structural, and in some cases as a catalytic molecule.”