Molecular Biology Quiz 6 (20 MCQs)

Quiz Instructions

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1. Which team of scientists ultimately discovered the double-helical structure of DNA and what was their technique?

Correct Answer: A) Watson&Crick, cardboard models.

2. Which process uses oxygen and food molecules to produce energy for animal cells.

Correct Answer: C) Cellular respiration.

3. In which year was chemical hypothesis proposed

Correct Answer: B) 1963.

4. Which of the following processes produces CO2?I. PhotosynthesisII. Alcohol (ethanol) fermentationIII. Lactic acid production

Correct Answer: B) II only.

5. The molecule that copies the genetic instructions from DNA is

Correct Answer: B) MRNA.

6. Which of the following best describes the flow of information in a cell?

Correct Answer: C) DNA $\rightarrow$ mRNA $\rightarrow$ proteintrait.

7. The process in which an RNA polymerase molecule assembles a mRNA molecule whose nucleotide sequence is complementary to the DNA sequence is called

Correct Answer: C) Transcription.

8. Which best describes a result of a well-balanced diet?

Correct Answer: A) Regulation of blood sugar levels.

9. Uncontrollable cell growth is known as .....

Correct Answer: B) Cancer.

10. TRANSLATION: Smaller segments of clover leaf shaped RNA that transport amino acids:

Correct Answer: B) Transfer RNA.

11. Where does DNA replication take place?

Correct Answer: A) Nucleus.

12. Enzymes used in industry are commonly

Correct Answer: A) Immobilized.

13. UAG, UGA, and UAA are stop codons. What does that mean?

Correct Answer: B) The building of the polypeptide is complete.

14. These are the region of lac operon EXCEPT

Correct Answer: A) CAMP site.

15. These are the stop codon sequence EXCEPT

Correct Answer: C) AUG.

16. How do gene mutations contribute to evolution?

Correct Answer: C) Natural selection favors beneficial mutations, so they survive and are passed on to future generations.

17. The central dogma of biology states that information flows in one direction from

Correct Answer: D) DNA to RNA to proteins.

18. The region of an operon where regulatory proteins bind is the

Correct Answer: A) Operator.

19. As temperature increases toward the optimal level, the kinetic energy of the enzyme and substrate ....., resulting in ..... collisions.

Correct Answer: A) Increases, more frequent.

20. Where in the cell does the first step of protein synthesis take occur?

Correct Answer: C) In the nucleus.