Question

what intermolecular force is responsible for holding the two strands of a dna double helix together?
phosphodiester bond
covalent bond
hydrogen bond
ionic bond

Explanation:

The two strands of a DNA double - helix are held together by hydrogen bonds between complementary base pairs (adenine - thymine and cytosine - guanine). Phosphodiester bonds link nucleotides within a single strand. Covalent bonds are a general type of strong chemical bond. Ionic bonds involve the transfer of electrons and are not relevant here.

Answer:

C. hydrogen bond