Question

Match the following and choose the correct combination from the option given.

	I		II
$\left(a\right)$	Nitrogen base	$\left(1\right)$	RNA
$\left(b\right)$	Nucleoside	$\left(2\right)$	Thymidylic acid
$\left(c\right)$	Nucleotide	$\left(3\right)$	Cytidine
$\left(d\right)$	Nucleic acid	$\left(4\right)$	Uracil

• A. $a-1,b-2,c-3,d-4$
• B. $a-1,b-3,c-2,d-4$
• C. $a-4,b-3,c-2,d-1$
• D. $a-4,b-1,c-2,d-3$
• E. $a-4,b-2,c-3,d-1$

Answer 1

The correct option is C $a-4,b-3,c-2,d-1$

The nitrogenous bases present in the DNA and RNA are purines and pyrimidines. Purines are double ring while pyrimidines are single ring structure. Adenine and guanine are purines while thymine, uracil, and cytosine are pyrimidines.

A nucleoside, in fact, contains a sugar molecule along with an organic nitrogenous base. Cytidine is a nucleoside formed by cytosine and ribose sugar.

The nucleotide is formed by the union of a phosphate group with a nucleoside. Thymidylic acid is formed by the combination of adenine as a nitrogenous base, ribose sugar, and triphosphate.

Nucleic acids are DNA and RNA. DNA is a genetic material which is mainly present in the nucleus of the cell in eukaryotes. In prokaryotes, they lie freely in the cytoplasm. RNA lies freely in the cytoplasm or in the nucleolus.

So, the correct answer is option C.