Molecular Biology Quiz 34 (20 MCQs)

Quiz Instructions

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1. ..... is thought to block the "accidental" transcription of "turned off" genes.

Correct Answer: B) Methylation of DNA.

2. According to Chargaff's rules, if DNA of a species contains 20% thymine, what percent of guanine will it contain?

Correct Answer: B) 30%.

3. Which is NOT scientific evidence for health risks associated with trans fats:

Correct Answer: A) Increased HDL cholesterol.

4. Which is not a benefit of lactose-free dairy products?

Correct Answer: D) Lower calorie content.

5. In translation, the language of the bases is turned into the language of .....

Correct Answer: B) Amino acids.

6. Flower color is an inherited trait. On a molecular level, which cellular function is responsible for flower color?

Correct Answer: A) Protein synthesis.

7. When DNA is copied, the new DNA has

Correct Answer: B) Each molecule has one old strand and one new strand.

8. Translation is the process of:

Correct Answer: C) Assembling a protein from RNA.

9. This enzyme is capable of breaking Hydrogen bonds found between the bases of DNA

Correct Answer: B) DNA Helicase.

10. Which is NOT a polymer of nucleotides?

Correct Answer: D) ATP.

11. Which is NOT a correct comparison between water and methane?

Correct Answer: B) Water freezes at a lower temperature.

12. STRUCTURE: One difference between RNA and DNA is -

Correct Answer: D) RNA is single stranded where DNA is double stranded.

13. RNA polymerase adds nucleotides to a new RNA chain that are complementary to

Correct Answer: A) The template strand.

14. Which scientists determined that DNA was a double helix?

Correct Answer: D) Watson & Crick.

15. T5 - What role does the tumor suppressor gene play in the cell cycle/cancer prevention?

Correct Answer: B) It stops the division of the cell until errors can be corrected.

16. The genetic code is

Correct Answer: D) Redundant.

17. RNA transcript grow in which direction

Correct Answer: B) 3' end.

18. Which nutrients most likely support a healthy BMI (body mass index)?

Correct Answer: A) Protein, water, and unsaturated fat.

19. Which process is used in polymerase chain reaction (PCR)?

Correct Answer: C) Replication.

20. These chemical tags inactivate or silence a gene.

Correct Answer: B) Methyl groups.