Structure of DNA showing complementary base pairing between adenine-thymine and guanine-cytosine, with deoxyribose sugar and phosphate backbone.

1. Identify the components of the DNA double helix shown in the image.
2. Recognize the base pairing rules: Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C).
3. Use the legend to match the colors to the respective bases: green for Adenine, red for Thymine, purple for Guanine, and yellow for Cytosine.
4. Observe the hydrogen bonds (dotted lines) between the bases, which indicate the pairing.
5. Confirm that the base pairs are correctly paired according to the rules (A-T and G-C).
6. Note the structure of the sugar-phosphate backbone (D for deoxyribose and P for phosphate) forming the sides of the helix.
7. Understand that the DNA strands are antiparallel, meaning they run in opposite directions.
8. Conclude that the image correctly represents the structure of DNA with proper base pairing and backbone components.