The two strands in double-helical DNA are held together by hydrogen bonds between
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- Phosphate and sugar group
- Nitrogenous bases and sugar
- Nitrogenous bases and phosphate
- Nitrogenous bases
The Correct Option is D
Solution and Explanation
Step 1: Concept
The DNA double helix is stabilized by specific interactions between the two anti-parallel strands.
Step 2: Analysis of Components
The backbone of each strand is held by covalent phosphodiester bonds (Sugar + Phosphate). The two strands connect in the center like rungs of a ladder.
Step 3: Reasoning
Complementary base pairing (Adenine with Thymine, Cytosine with Guanine) occurs via hydrogen bonds between the nitrogenous bases.
Step 4: Conclusion
Hydrogen bonds occur strictly between the nitrogenous bases. Final Answer: (D)
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