DNA Structure and Replication Quiz

1. Which of these is not a nitrogenous base?

• Adenine
• Leucine
• Guanine
• Cytosine

2. What molecule makes up the DNA backbone along with the phosphates?

• Base
• Sugar
• Phosphate group
• Hydrogen bond

3. DNA replication is called ____________________, because one strand is new and one strand is old?

• Semi-conservative
• Conservative
• Dispersive
• Independent

4. What type of bond holds the nitrogen bases together?

• Phosphate bond
• Hydrogen bond
• Nitrogen bond
• Ionic Bond

5. During DNA replication, which enzyme adds new nucleotides to build the new strands of DNA?

• Helicase
• DNA Polymerase
• Ligase
• Pepsin

6. What are the three parts of a nucleotide?

• Deoxyribose sugar, Phosphate, Nitrogen Base
• Adenine, Phosphate, Helicase
• Deoxyribose sugar, Phosphate, Amino Acid
• Lipid, Nitrogen Base, Phosphate

7. Which enzyme unwinds or unzips the DNA in replication?

• Helicase
• DNA Polymerase
• Ligase
• Pepsin

8. What is the shape of DNA called?

• Single helix
• Double helix
• Triple helix
• Quadruple helix

9. Which base is complimentary to Adenine?

• Thymine
• Cytosine
• Guanine
• Adenine

10. If Cytosine is present at 30%, what is the percent of Adenine?

• 5
• 15
• 30
• 20