AP BIOLOGY

Detailed explanation-1: -Explanation: The type of bond that holds the phosphate group to the sugar in DNA’s backbone is called a phosphodiester bond .

Detailed explanation-2: -Covalent bonds occur within each linear strand and strongly bond the bases, sugars, and phosphate groups (both within each component and between components). Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing.

Detailed explanation-3: -The bond formed between the sugar of one nucleotide and the phosphate of an adjacent nucleotide is a covalent bond. A covalent bond is the sharing of electrons between atoms. A covalent bond is stronger than a hydrogen bond (hydrogen bonds hold pairs of nucleotides together on opposite strands in DNA).

Detailed explanation-4: -Phosphate Backbone Attached to each sugar is one of four bases–adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.

Detailed explanation-5: -Bases are held together by hydrogen bonds, and the DNA backbone is held together by phosphodiester bonds.