Question

which three descriptions correctly describe the diagram of dna above? select the three best answers. the ring structures shown here contain nitrogen (n) atoms and some double bonds. in the lower hydrogen bond shown here, the hydrogen (h) atom involved has a partial positive charge because the more electronegative nitrogen (n) atom it is bonded to has pulled the shared electrons away from the hydrogen nucleus. to the right, the nitrogen (n) involved is bonded to two carbon atoms and has a partial negative charge because of its higher electronegativity. the part of one strand in dna on the left and the part of the second strand in dna, on the right, are actually identical—they are just mirror images of one another (meaning, their orientations are flipped). in the upper hydrogen bond shown here, the oxygen (o) involved is double - bonded to a carbon and has a partial negative charge because of its higher electronegativity. to the right, the hydrogen (h) atom involved has a partial positive charge because the more electronegative nitrogen (n) atom it is bonded to has pulled the shared electrons away from the hydrogen nucleus.

Explanation:

1. In a hydrogen - bonding situation, the hydrogen atom in a polar bond (such as N - H) has a partial positive charge because the more electronegative atom (N in this case) pulls the shared electrons away from the hydrogen nucleus.
2. The parts of the DNA strands shown are not mirror images. They are complementary base - pairs with specific orientations.
3. The nitrogen atom involved in the bond with hydrogen has a partial negative charge due to its higher electronegativity compared to hydrogen.

Answer:

• The hydrogen (H) atom involved has a partial positive charge because the more electronegative nitrogen (N) atom it is bonded to has pulled the shared electrons away from the hydrogen nucleus.
• The part of one strand in DNA on the left and the part of the second strand in DNA, on the right, are not identical - they are complementary base - pairs with specific orientations.
• The nitrogen (N) involved is bonded to two carbon atoms and has a partial negative charge because of its higher electronegativity.