Question

• rna is usually single-stranded, not double-stranded. put each diagram in the correct column. dna nucleotides rna nucleotides

Explanation:

To determine if a nucleotide is DNA or RNA, we check the sugar (ribose for RNA, deoxyribose for DNA) and the nitrogenous base (uracil in RNA, thymine in DNA; DNA has deoxyribose, RNA has ribose).

• DNA nucleotides: Contain deoxyribose (sugar with one less OH group, i.e., has an H instead of OH at the 2’ position) and nitrogenous bases adenine, guanine, cytosine, or thymine. From the diagrams, the ones with deoxyribose (yellow - colored sugar) are the second (guanine with deoxyribose) and fourth (adenine with deoxyribose) diagrams.
• RNA nucleotides: Contain ribose (sugar with two OH groups at 2’ and 3’ positions) and nitrogenous bases adenine, guanine, cytosine, or uracil. From the diagrams, the ones with ribose (gray - colored sugar) are the first (cytosine with ribose) and third (uracil with ribose) diagrams.

Answer:

• DNA nucleotides: The second diagram (with deoxyribose, phosphate group, and guanine) and the fourth diagram (with deoxyribose, phosphate group, and adenine).
• RNA nucleotides: The first diagram (with ribose, phosphate group, and cytosine) and the third diagram (with ribose, phosphate group, and uracil).