Question

rna, like dna, is a nucleic acid made of a long chain of nucleotides. but there are important differences between rna and dna. the model below compares the typical structures of rna and dna. all possible rna and dna nucleotides are shown. what are the main differences between rna and dna? select all that apply. rna contains sulfate groups instead of phosphate groups. the 5 - carbon sugar in rna is ribose instead of deoxyribose. rna is usually single - stranded, not double - stranded. rna has a nitrogenous base called uracil instead of thymine.

Explanation:

1. Analyze the first option: RNA has a phosphate - ribose backbone, not sulfate groups. So the first option is incorrect.
2. Analyze the second option: DNA has deoxyribose (a 5 - carbon sugar with one less oxygen atom) and RNA has ribose as its 5 - carbon sugar. This is a correct difference.
3. Analyze the third option: DNA is typically double - stranded (double helix), while RNA is usually single - stranded. This is a correct difference.
4. Analyze the fourth option: In DNA, the nitrogenous base is thymine, and in RNA, it is uracil (both pair with adenine in their respective base - pairing rules). This is a correct difference.

Answer:

B. The 5 - carbon sugar in RNA is ribose instead of deoxyribose.
C. RNA is usually single - stranded, not double - stranded.
D. RNA has a nitrogenous base called uracil instead of thymine.