This quiz works best with JavaScript enabled. Home > Biology > Molecular > Molecular Biology – Quiz 17 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 17 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In a gel electrophoresis the short strands travel ..... distances while the long strands travel ..... distances. A) Long, short. B) Short, long. C) It depends on the charge. D) None of above. Show Answer Correct Answer: A) Long, short. 2. What is the gel-like substance inside of cells called? A) Photoplasm. B) Photosynthesis. C) Cytoskeleton. D) Cytoplasm. Show Answer Correct Answer: D) Cytoplasm. 3. Which refers to the breakdown of macromolecules into simpler building blocks? A) Metabolism. B) Catabolism. C) Anabolism. D) Condensation. Show Answer Correct Answer: B) Catabolism. 4. A student isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. After adding some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has the student probably left out of the mixture? A) DNA polymerase. B) DNA ligase. C) Okazaki fragments. D) Primase. Show Answer Correct Answer: B) DNA ligase. 5. Enzymes are classified as which of the following biological organic compounds? A) Carbohydrates. B) Lipids. C) Proteins. D) Nucleic acids. Show Answer Correct Answer: C) Proteins. 6. A mutation is defined as: A) A change in the cell's structure. B) Anything that changes in an embryo. C) Any change in the physical features of a human. D) A change in the DNA sequence. Show Answer Correct Answer: D) A change in the DNA sequence. 7. Which is the primary molecule in the cell that is broken down to get energy? A) Salt. B) Sugar. C) Water. D) Protein. Show Answer Correct Answer: B) Sugar. 8. This nucleic acid is single stranded A) DNA. B) RNA. C) Both. D) None of above. Show Answer Correct Answer: B) RNA. 9. Codons contain ..... bases A) 1. B) 3. C) 6. D) 9. Show Answer Correct Answer: B) 3. 10. This is a sequence of nucleotides from a section of mRNA.AUGAAACGCACGCAGFrom which DNA sequence has it been transcribed? A) ATGAAACGCACGCAG. B) UACUUUGCGUGCGAC. C) TACUUUGCGTGCGTC. D) TACTTTGCGTGCGTC. Show Answer Correct Answer: D) TACTTTGCGTGCGTC. 11. In gene regulation a gene is "turned on" by a(n) A) Activator. B) Promoter. C) Repressor. D) Stimulator. Show Answer Correct Answer: A) Activator. 12. When DNA is transcribed to RNA..... A) A pairs with U. B) C pairs with U. C) A pairs with T. D) C pairs with T. Show Answer Correct Answer: A) A pairs with U. 13. The two "backbones" of the DNA molecule consist of A) Adenine and sugars. B) Phosphates and sugars. C) Adenines and thymines. D) Thymines and sugars. Show Answer Correct Answer: B) Phosphates and sugars. 14. What type of bond is formed when correct base pairs come together? A) Sulphur bonds. B) Ionic bonds. C) Hydrogen bonds. D) Covalent bonds. Show Answer Correct Answer: C) Hydrogen bonds. 15. How many codons are needed to specify for five amino acids? A) 3. B) 5. C) 15. D) 30. Show Answer Correct Answer: B) 5. 16. What is the function of messenger RNA? A) To transfer the code from the DNA in the nucleus to the ribosome in the cytoplasm. B) To store and pass on genetic information. C) To assist in building proteins by adding amino acids in the ribosome. D) To create the energy needed for cellular processes. Show Answer Correct Answer: A) To transfer the code from the DNA in the nucleus to the ribosome in the cytoplasm. 17. Which enyzme would be found only on the lagging strand? A) DNA polymerase. B) Primase. C) Ligase. D) Topoisomerase. Show Answer Correct Answer: C) Ligase. 18. How many amino acids can be represented by a single 3-base DNA sequence? A) 1. B) 3. C) 6. D) 8. Show Answer Correct Answer: A) 1. 19. What enzyme builds the mRNA strand during transcription? A) DNA polymerase. B) Helicase. C) Primase. D) RNA polymerase. Show Answer Correct Answer: D) RNA polymerase. 20. Of the following products, which is produced by both anaerobic respiration and aerobic respiration in humans?I. PyruvateII. ATPIII. Lactate A) I only. B) I and II only. C) I, II and III. D) II and III only. Show Answer Correct Answer: B) I and II only. ← PreviousNext →Related QuizzesBiology QuizzesMolecular Biology Quiz 1Molecular Biology Quiz 2Molecular Biology Quiz 3Molecular Biology Quiz 4Molecular Biology Quiz 5Molecular Biology Quiz 6Molecular Biology Quiz 7Molecular Biology Quiz 8Molecular Biology Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books