Question

select the statement that is true. (1 point)

thymine is only present in dna, while cytosine is only present in rna.

translation copies dna to mrna, while transcription converts mrna into proteins.

dna has the sugar deoxyribose, while rna has the sugar ribose.

dna and rna are both double - stranded.

Explanation:

1. For the first option: Cytosine is present in both DNA and RNA; only thymine (DNA) and uracil (RNA) are unique to each nucleic acid, so this is false.
2. For the second option: Transcription copies DNA to mRNA, while translation converts mRNA to proteins, so this statement reverses the processes and is false.
3. For the third option: The sugar in DNA is deoxyribose (lacks an oxygen on the 2' carbon), and RNA contains ribose (has the 2' oxygen), so this is true.
4. For the fourth option: DNA is typically double-stranded, while most RNA (like mRNA, tRNA) is single-stranded, so this is false.

Answer:

DNA has the sugar deoxyribose, while RNA has the sugar ribose.