Question

Why is a DNA molecule called a double helix?
A. A DNA molecule always has two strands of nucleotides.
B. Each nucleotide has two main parts: a base and a phosphate.
C. The sugar and phosphate parts are the same in all DNA molecules.
D. There are two kinds of nitrogen bases in a DNA molecule.

Answer 1

Answer:

A

Explanation:

Because there are two DNA strands in the DNA molecule and they both rotate around each other in a helix formation. So two helixes = double helix.

Answer 2

Answer:

A

Explanation: