Question

In the ribose of RNA, unlike DNA, every nucleotide residue has an additional

• A. $COOH$ group in $2^{{}^{\prime }}$ position
• B. $OH$ group in $5^{{}^{\prime }}$ position
• C. $OH$ group in $2^{{}^{\prime }}$ position
• D. Phosphate group in $2^{{}^{\prime }}$ position
• E. Uracil in $5^{{}^{\prime }}$ position

Answer 1

The correct option is C $OH$ group in $2^{{}^{\prime }}$ position

RNA has ribose sugar. It is a five carbon sugar. It differs from the deoxyribose sugar in having OH at second carbon atom. DNA is made up of nitrogenous base, phosphate and sugar. It has deoxyribose sugar which has hydrogen at second carbon. The sugar is linked to nitrogenous base at the first carbon by glycosidic bond. It has five carbon so it is a pentose sugar. It has a chemical formula of C${}_5$H${}_{10}$O${}_4$.

So, the correct answer is option C.