Question

Which of the following is correct about $H$-bonding in $DNA$?

• A. $A-T, G-C$
• B. $A-G, T-C$
• C. $G-T, A-C$
• D. $A-A, T-T$

Answer 1

Answer: (A)

$A-T, G-C$

Answer 2

In DNA double helix, the correct bonding (hydrogen bonding) between nitrogenous bases of two helix is
$A \rightarrow T$ or $T \rightarrow A , \quad C \rightarrow G$ or $G \rightarrow C$