Question

which answer below accurately describes the structure of dna

Answer 1

The structure of DNA (deoxyribonucleic acid) is best described as a double helix. This double helix consists of two long strands of nucleotides that are twisted around each other. Each nucleotide is made up of a sugar (deoxyribose), a phosphate group, and a nitrogenous base. The nitrogenous bases (adenine, thymine, cytosine, and guanine) pair specifically (adenine with thymine and cytosine with guanine) through hydrogen bonds, forming the rungs of the helical ladder. The sugar and phosphate groups make up the backbone of the DNA strands. The overall structure is often compared to a spiral staircase or a twisted ladder.