Question

Energy bonds in double helix structure of DNA, which are responsible for holding the two strands together are:

• A. Covalent bonds
• B. Sulfur bonds
• C. Hydrogen bonds
• D. Zinc finger motifs

Hint:

Hydrogen bonds:
- Hold complementary base pairs together.
- A-T: 2 hydrogen bonds.
- G-C: 3 hydrogen bonds.
- Covalent bonds: Hold nucleotides together in each strand.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
This question tests knowledge of DNA structure.

Step 2: Detailed Explanation:
The two strands of DNA are held together by hydrogen bonds.
These form between complementary base pairs:
- Adenine (A) pairs with Thymine (T) via 2 hydrogen bonds.
- Guanine (G) pairs with Cytosine (C) via 3 hydrogen bonds.
Covalent bonds (A): Hold nucleotides within each strand (phosphodiester bonds).
Sulfur bonds (B): Disulfide bonds in proteins.
Zinc finger motifs (D): DNA-binding motifs in proteins.
Thus, hydrogen bonds hold the two strands together.

Step 3: Final Answer:
Thus, hydrogen bonds hold the two strands of DNA together, which corresponds to option (C).
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