Which among the following bond holds DNA bases together in a double helix ?

Hydrogen bond .

The correct answer is Option (3) -Hydrogen bond .

The bond that holds DNA bases together in a double helix is the Hydrogen bond.

In the DNA double helix structure, two complementary strands are held together by hydrogen bonds between pairs of nitrogenous bases. The specific base pairing is as follows:

• Adenine (A) forms two hydrogen bonds with Thymine (T).
• Thymine (T) forms two hydrogen bonds with Adenine (A).
• Guanine (G) forms three hydrogen bonds with Cytosine (C).
• Cytosine (C) forms three hydrogen bonds with Guanine (G).

These hydrogen bonds contribute to the stability of the DNA double helix by holding the complementary strands together. The hydrogen bonding between specific base pairs allows DNA to carry and transmit genetic information through the precise pairing of adenine with thymine and guanine with cytosine.