How to use this worksheet
- Study your resources to gain an understanding of the structure of deoxyribonucleic acid (DNA).
- Test your knowledge using the worksheet questions below.
- Download these worksheet questions for free by clicking “Download” here:
- Download this worksheet’s Answer Key for free by clicking “Download” here:
DNA Structure Worksheet
1. What does “DNA” stand for?
2. Within which organelle is DNA found in eukaryotic cells?
- Nucleus
- Endoplasmic reticulum
- Ribosome
- Mitochondria
- Plasmid
- Golgi apparatus
3. What long polymer molecules serve as the information storage device in a cell?
- Carbohydrates
- Acetylcholine
- Microvilli
- Nucleic acids
- Steroids
- Cyclic AMP
4. True or False: Nucleotides are composed of nucleic acids.
5. What is a nucleotide composed of? (Select all that apply)
- 5-carbon sugar
- Phosphate group
- Cholesterol
- GABA
- Nitrogenous base
- ATP
6. How many different kinds of nucleotides does DNA contain?
- One (1)
- Two (2)
- Three (3)
- Four (4)
- Five (5)
- Six (6)
7. Which component of a nucleotide differs between types of nucleotide?
8. Describe the different kinds of nucleotides found in DNA.
9. How does a nucleic acid form?
10. How does the structure of a nucleic acid allow it to store information?
11. Which of the following best describes the structure of DNA?
Choice #1: Two (2) polynucleotide chains composed of mononucleotides covalently bonded between the sugar of one mononucleotide and the phosphate of another to form a sugar-phosphate backbone. Complementary nitrogenous bases attached to the sugar-phosphate backbone point inward toward each other and are linked by hydrogen bonds.
Choice #2: Two (2) nucleotides bonded to the sugar molecule of a carbon isotope by covalent bonds. The isotopes form a sugar-carbon backbone. Complementary phosphoric bases attached to the sugar-carbon backbone point inwards toward each other and are linked by covalent bonds.
12. Why are only two complementary base pairs possible in DNA?
13. Fill in the blank: Write the nucleotide that bonds to each of the listed nucleotides.
- Adenine (A)
- Cytosine (C)
- Guanine (G)
- Thymine (T)
14. Why are hydrogen bonds essential to the structure of DNA?
15. The backbone of DNA consists of?
- Carbon-sulphur chains
- Sugar-phosphate chains
- Iron-carbon chains
- Lipid-sulphur chains