Question

dna and rna differ mainly in that:
○ dna contains ribose and rna contains deoxyribose
○ dna is single - stranded and rna is double - stranded
○ dna is double - stranded and rna is single stranded
○ they are both identical

Explanation:

DNA (deoxyribonucleic acid) is typically double - stranded, forming a double helix structure. RNA (ribonucleic acid) is usually single - stranded. Regarding the sugar component, DNA contains deoxyribose and RNA contains ribose. So the first option is wrong. The second option has the strand information reversed. And DNA and RNA are not identical as they have different structures, sugar components, and functions.

Answer:

DNA is double - stranded and RNA is single stranded