Question

Which carbon atom of deoxy Ribose sugar in DNA does NOT contain....... bond ?

• A. $C_5$
• B. $C_3$
• C. $C_2$
• D. $C_1$

Answer 1

Answer: (C)

Deoxyribose is a pentose sugar with five carbon atoms. The four carbon atoms of the ring are numbered 1', 2', 3' and 4' The carbon atom of - $C{H}_{2}OH$ is numbered 5'There are three $—OH$ groups at position 1' , 3' and 5' Hydrogen atoms are attached to carbon atoms 1', 2', 3', 4' and 5' Only carbon atom at $C_2$ of deoxyribose sugar in DNA does not contain $—C—OH$ bond.



Note The prefix 2' - deoxy means that oxygen is missing from the 2' position of ribose.