Which of the following is the best definition of DNA?

A. A molecule made up of a long string of amino acids

B. A double-stranded molecule with coded instructions for an

organism's physical characteristics

C. Any organic molecule that contains carbon, hydrogen, and oxygen

D. The basic unit of a nucleic acid, made of a phosphate, sugar ring,

and nucleotide base

Option B. A double-stranded molecule with coded instructions for anorganism's physical characteristics, is the correct statement.

Explanation:

DNA is a genetic material which contains information about the physical features and characteristics of an organism. It is composed of five carbon sugar, phosphate group and nitrogenous base. The DNA base are adenine, cytosine, guanine, and thymine.