Question

how does dna code for proteins in a cell?
by the particular order of nitrogen bases in a cell
by using its phosphate and sugar molecules
by adding more hydrogen bonds to its structure
by creating a new double helix structure

Explanation:

DNA contains nitrogen - bases (A, T, C, G). The sequence of these bases in the DNA molecule forms the genetic code. This code is transcribed into mRNA and then translated into proteins, where each set of three bases (codon) codes for a specific amino - acid. The order of amino - acids in a protein is determined by the order of nitrogen bases in the DNA.

Answer:

By the particular order of nitrogen bases in a cell