Question

Which of the following is not a feature of B-DNA ? A. Right handed double helix
B. 12 base pairs per turn of helix
C. Wide major grooves and narrow minor grooves
D. Anti glycosyl bond conformation at C and syn at G
E. Pitch per turn of helix \(33.2 \AA\)
Choose the correct answer from the options given below :

• A. \(A, C\) only
• B. \(B, E\) only
• C. \(C, D\) only
• D. \(B, D\) only

Hint:

Remember important features of B-DNA: \[ \text{Right-handed helix} \] \[ 10 \text{ bp per turn} \] \[ 34 \AA \text{ pitch} \]
• A-DNA \(\rightarrow\) About \(11-12\) bp/turn
• Z-DNA \(\rightarrow\) Left-handed helix with syn conformation at G

Answer 1

The Correct Option is D