Question

The DNA double helix does not have which of the following?

a) Hydrogen bonds
b) Phosphodiester bonds
c) Antiparallel strands
d) Covalent bonds between base pairs

Answer 1

b) Phosphodiester bonds.

Step-by-step explanation:

The DNA double helix is held together by hydrogen bonds between complementary base pairs (option a), and the strands run antiparallel to each other (option c). However, the covalent bonds between base pairs are not present in DNA; instead, the covalent bonds are formed between the sugar and phosphate groups, creating the backbone of the DNA molecule. These covalent bonds are known as phosphodiester bonds (option b).

Answer 2

The DNA double helix does not have covalent bonds between base pairs. The base pairs are held together by hydrogen bonds.

Step-by-step explanation:

The DNA double helix does not have d) Covalent bonds between base pairs. The covalent bonds are actually formed between the sugar phosphate backbone of the DNA molecule. The base pairs are held together by hydrogen bonds.