Question

Match the column I with column II and mark the appropriate choice.

Column I	Column II
(A) Nucleoside	(i) Sugar + base + phosphate group
(B) Nucleotide	(ii) Cytosine + uracil
(C) DNA	(iii) Sugar + base
(D) RNA	(iv) Cytosine + thymine

• A. (A) $\to$ (iii); (B) $\to$ (i); (C) $\to$ (iv); (D) $\to$ (ii)
• B. (A) $\to$ (i); (B) $\to$ (iv); (C) $\to$ (iii); (D) $\to$ (ii)
• C. (A) $\to$ (i); (B) $\to$ (iii); (C) $\to$ (i); (D) $\to$ (iv)
• D. (A) $\to$ (iv); (B) $\to$ (ii); (C) $\to$ (i); (D) $\to$ (iii)

Answer 1

The correct option is A (A) $\to$ (iii); (B) $\to$ (i); (C) $\to$ (iv); (D) $\to$ (ii)

(A) Nucleoside $\to$ Sugar + base (iii)

A nucleoside consists simply of a nucleobase (nitrogenous base) and a five-carbon sugar.

(B) Nucleotide $\to$ Sugar + base + phosphate group (i)

Nucleotides are composed of three subunit molecules: a nitrogenous base, a five-carbon sugar, and at least one phosphate group.

(C) DNA $\to$ Cytosine + thymine (iv)

The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T).

(D) RNA $\to$ Cytosine + uracil (ii)

Cellular organisms use messenger RNA (mRNA) to convey genetic information using the nitrogenous bases of guanine (G), uracil (U), adenine (A), and cytosine (C).