DNA Structure and Replication Worksheet
An engaging worksheet for Grade 9 Science students covering the fundamental structure of DNA and the process of DNA replication.
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DNA Structure and Replication
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Read each question carefully and answer to the best of your ability. Use complete sentences for short answer questions.
1. Which of the following best describes the structure of DNA?
Single helix
Triple helix
Double helix
Random coil
2. Which of the following nitrogenous bases pairs with Guanine in a DNA molecule?
Adenine
Thymine
Cytosine
Uracil
3. The process by which DNA makes a copy of itself is called .
4. DNA is made up of repeating units called .
5. DNA replication is a conservative process, meaning the original DNA molecule remains intact and a new one is synthesized.
True
False
6. Label the components of the DNA double helix shown below.
7. Briefly describe the role of hydrogen bonds in maintaining the DNA double helix structure.
8. Explain why DNA replication is considered 'semiconservative'.
Use the words from the word bank to complete the sentences below.
9. The enzyme unwinds the DNA double helix during replication.
10. New DNA strands are synthesized by the enzyme .