Question

In DNA, the number of hydrogen bonds that hold each adenine-thymine base pair and each guanine-cytosine base pair, respectively, are _ _ _.

• A. 3 and 3
• B. 2 and 2
• C. 2 and 3
• D. 3 and 2

Hint:

Remember: A–T has 2 hydrogen bonds, while G–C has 3 hydrogen bondsThis makes G–C pairs more stable

Answer 1

The Correct Option is C

Step 1: Recall base pairing in DNA.
In DNA, nitrogenous bases pair specifically as per complementary base pairing rulesAdenine pairs with thymine, and guanine pairs with cytosine

Step 2: Hydrogen bonds in A–T pair.
Adenine (A) and thymine (T) are held together by two hydrogen bonds

Step 3: Hydrogen bonds in G–C pair.
Guanine (G) and cytosine (C) are held together by three hydrogen bonds

Step 4: Conclusion.
\[ \boxed{2 \text{ and } 3} \]