DNA structure and replication Quiz
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5 questions, one answer each
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1. Which base pairs with cytosine in DNA?
- A. Adenine
- B. Thymine
- C. Guanine
- D. Uracil
2. Which enzyme breaks the hydrogen bonds between the two DNA strands during replication?
- A. DNA polymerase
- B. DNA ligase
- C. DNA helicase
- D. Amylase
3. A DNA sample has 30% thymine. What percentage is cytosine?
- A. 20%
- B. 30%
- C. 40%
- D. 70%
4. Which bond joins two nucleotides in the same strand?
- A. Hydrogen
- B. Phosphodiester
- C. Glycosidic
- D. Ionic
5. In a ¹⁵N to ¹⁴N experiment, what is the DNA density of the first generation if replication is semi-conservative?
- A. All heavy
- B. All intermediate
- C. All light
- D. Half heavy and half light