Discussion Forum



1)

Which carbon  atom of deoxyribose sugar in DNA   does not contain 

156202118_p2.PNG bond?


A) $C_{5}$

B) $C_{3}$

C) $C_{2}$

D) $C_{1}$

Answer:

Option C

Explanation:

 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  -CH2OH  is numbered 5'. These 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 C2 of deoxyribose sugar in DNA  does not contain -C-OH bond.

1562021984_c1.PNG

 

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