EVERYDAY SCIENCE

Detailed explanation-1: -Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing. These hydrogen bonds are individually weak but collectively quite strong. a template during DNA replication.

Detailed explanation-2: -The 2 strands of DNA are held together by hydrogen bonds between N2 bases.

Detailed explanation-3: -The two strands are held together by hydrogen bonds between pairs of bases: adenine pairs with thymine, and cytosine pairs with guanine.

Detailed explanation-4: -In these crystals, the functional groups of the DNA bases that are involved in Watson−Crick hydrogen bonding can also enter (hydrogen bonding) interactions with water molecules, hydroxyl groups of sugar residues, and Na+ counterions.

Detailed explanation-5: -Hydrogen bonding stabilizes DNA double helices across the helix axis but not in the direction of the axis 1. In DNA, the deoxyribose-phosphate backbone can act as hydrogen-bond acceptor only through phosphate and sugar oxygen atoms.