DNA structure worksheet with questions and a labeled diagram of the DNA double helix.

A worksheet titled "Part 1: DNA Structure" with questions about DNA components, nucleotides, and base pairing, featuring a diagram of a DNA double helix with labeled parts.

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1.
A. Deoxyribose
B. Phosphate group
C. Nitrogenous base
D. Hydrogen bond

2.
A. Three molecules make up a nucleotide.
B. There are four types of nitrogenous bases in DNA: adenine, thymine, cytosine, and guanine.
C. A sugar molecule is deoxyribose.

3.
The number of purines (adenine and guanine) equals the number of pyrimidines (thymine and cytosine) because adenine pairs with thymine and guanine pairs with cytosine.

4.
If a section of DNA contains 120,000 guanine molecules, it also contains 120,000 cytosine molecules due to complementary base pairing.

5.
If you found out 29% of your DNA was made up of Guanine, then:
- The amount of cytosine is 29%.
- The amount of adenine is 21%.
- The amount of thymine is 21%.

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