Question

the cell. dna is a double - stranded helix composed of deoxyribose sugar, phosphate groups, and four nitrogenous bases (adenine, thymine, cytosine, and guanine). it remains in the cell nucleus, where it stores the genetic information of an organism.
rna, on the other hand, is generally single - stranded and contains ribose sugar instead of deoxyribose. the nitrogenous bases in rna are adenine, uracil, cytosine, and guanine. rna can be found both in the cell nucleus (as mrna) and in the cytoplasm (as trna and rrna). rna acts as a temporary copy of genetic information, participating in processes such as transcription and translation, which facilitate protein synthesis.
what structure is dna?
double - stranded
triple - stranded
single - stranded

Explanation:

The text clearly states "DNA is a double - stranded helix".

Answer:

A. double - stranded