Question

identify the numbered parts of the dna molecule below and write the name on the corresponding lines.
hydrogen bond nucleotide
nitrogenous base sugar - phosphate backbone
9.
10.
11.
12.
(there is a dna structure diagram on the right side of the text, with numbers 9, 10, 11, 12 marked on it)

Explanation:

• 9: The outer structure of the DNA strand (the "backbone") is made of alternating sugar and phosphate groups, so this is the sugar - phosphate backbone.
• 10: The dashed lines between the nitrogenous bases are hydrogen bonds, which hold the two strands of DNA together.
• 11: The circled part is a single unit that makes up the DNA strand, consisting of a sugar, phosphate, and nitrogenous base, so it's a nucleotide.
• 12: The part labeled (like C, which is a base) is a nitrogenous base, one of the components of the nucleotide that pairs with other bases.

Answer:

1. sugar - phosphate backbone
2. Hydrogen Bond
3. nucleotide
4. Nitrogenous base