Question

important differences between rna and dna. • the 5-carbon sugar in rna is ribose instead of deoxyribose. • rna has a nitrogenous base called uracil instead of thymine. • rna is usually single-stranded, not double-stranded. select all the nucleotides that can be found in rna, but not dna.

Explanation:

1. Recall RNA vs DNA differences: RNA has ribose (not deoxyribose) and uracil (not thymine).
2. Analyze each nucleotide:

• First: Sugar is ribose, base is cytosine (cytosine is in both, but sugar is ribose - RNA - specific sugar here).
• Second: Sugar is ribose, base is uracil (uracil is RNA - specific base, ribose is RNA - specific sugar).
• Third: Sugar is deoxyribose (DNA - specific sugar), so DNA - related.
• Fourth: Sugar is deoxyribose (DNA - specific sugar), so DNA - related.

So the first (cytosine - ribose - phosphate) and second (uracil - ribose - phosphate) nucleotides are RNA - only (in context of these options, as they have ribose/uracil which DNA lacks).

Answer:

The nucleotides found in RNA but not DNA are the first (with cytosine and ribose) and the second (with uracil and ribose) ones.