In essence, DNA is a thin and very, very long organic molecule. It is a polymer, and each of the monomers that constitute it are called

nucleotides

Explanation:

DNAs are long-chain, helical macromolecules that store genetic information They are made up of varying sequences of covalently bonded monomers called nucleotides. Four types of nucleotides make up the nucleic acid DNA, these include Adenine, Guanine, Cytosine and Thymine.

Unlike other macromolecules,  these are typically not used as an energy source and only encode protein synthesis. They comprise a 5-Carbon deoxyribose sugar, one nitrogenous base (adenine, guanine thymine, and cytosine) and a phosphate group.

Nitrogenous bases encourage base-pair formation through hydrogen bonding. Adenine forms double bonds with thymine, while cytosine forms triple bonds with guanine.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation: