Question

the image contains labels such as dna, rna, ribose - phosphate backbone, deoxyribose - phosphate backbone, purine bases, pyrimidine bases, hydrogen bonds between base pairs, and two molecular structure diagrams (one likely of rna and one of dna).

Explanation:

1. The left single-stranded molecule contains uracil (U) and a ribose-phosphate backbone, so it matches RNA. Its backbone is the ribose-phosphate backbone, and the labeled cytosine (C) is a pyrimidine base.
2. The right double-stranded molecule contains thymine (T) and a deoxyribose-phosphate backbone, so it matches DNA. The dotted lines between paired bases are hydrogen bonds, the labeled guanine (G) is a purine base, and the alternating phosphate (P) and sugar is the deoxyribose-phosphate backbone.

Answer:

• Bottom left box (points to single strand): RNA
• Bottom right box (points to double helix): DNA
• Top left box (points to C on single strand): Pyrimidine bases
• Middle top box (points to G on double helix): Purine bases
• Top right box (points to dotted lines): Hydrogen bonds between base pairs
• Bottom right box (points to P/sugar on double helix): Deoxyribose-phosphate backbone
• Top left box (points to backbone of single strand): Ribose-phosphate backbone