Which statement describes a dna molecule? a) it is single stranded b) it has a double-helix shape c) it is made completely of protein. d) it contains two types of nitrogenous bases.

Option B

Explanation:

The Deoxyribonucleic acid can be defined as a double stranded molecule made up of nucleic acids. The double helical structure that consists of the nucleic acid arises as a consequence of its secondary structure.

The double helix structure of the DNA is kept together by the nitrogenous bases that bind together.This double helix structure is right handed structure.

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse