This quiz works best with JavaScript enabled. Home > Biology > Molecular Biology – Quiz 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 22 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Why do cells make RNA instead of making protein directly from DNA? A) The DNA is used less to avoid damage and can always remain in the nucleus in eukaryotes. B) The amount of protein made can be controlled by disposing of the RNA when the protein is no longer needed. C) By making many mRNA molecules of a gene, a cell can make many copies of a protein quickly. D) All of the above. Show Answer Correct Answer: D) All of the above. 2. Nitrogenous bases are held together by ..... bonds. A) Carbon. B) Hydrogen. C) Phosphate. D) Nitrogen. Show Answer Correct Answer: B) Hydrogen. 3. Which type of chemical reaction is an example of anabolism? A) Phytolysis. B) Combustion. C) Hydrolysis. D) Condensation. Show Answer Correct Answer: D) Condensation. 4. In messenger RNA, each codon specifies a particular A) Nucleotide. B) Enzyme. C) Amino acid. D) Promoter. Show Answer Correct Answer: C) Amino acid. 5. The strand of DNA that is replicated continuously from 5' to 3' is known as A) Leading strand. B) Lagging strand. C) Parallel strand. D) Antiparallel strand. Show Answer Correct Answer: A) Leading strand. 6. HIGH LEVELS OF GLUCOSE in the blood may be a symptom of which disease? A) Asthma. B) Cancer. C) Diabetes. D) Heart disease. Show Answer Correct Answer: C) Diabetes. 7. HISTORY: Rosalind Franklin used x-ray crystallography to determine that the shape of the DNA molecule is: A) A cloverleaf. B) A braided rope. C) A pleated sheet. D) A twisted ladder. Show Answer Correct Answer: D) A twisted ladder. 8. Which is most likely a potential health problem for someone with a diet high in sugar and fat and low in protein and fiber? A) Obesity. B) Blindness. C) Lung cancer. D) Stomach ulcers. Show Answer Correct Answer: A) Obesity. 9. Classical concept of gene was introduced by..... A) Rosalind Franklin. B) Sutton. C) Gregor Mendel. D) Watson and Crick. Show Answer Correct Answer: B) Sutton. 10. What is need for a protein to achieve quartenary structure? A) The right amino acid sequence. B) Interactions between close amino acids. C) Interactions between distant amino acids. D) 2 or more proteins together in a complex. Show Answer Correct Answer: D) 2 or more proteins together in a complex. 11. What controls a metabolic pathway A) Enzymes. B) Chemicals. C) Intermediates. D) Energy. Show Answer Correct Answer: A) Enzymes. 12. Which type of cell is a stem cell? A) A cell that has not specialized yet. B) A cell that has expressed its genotype. C) A cell that has specialized into a stem cell. D) A cell that has changed from a skin cell to a stem cell. Show Answer Correct Answer: A) A cell that has not specialized yet. 13. Cellular respiration is..... A) The process by which cells break down glucose into ATP energy. B) The process by which cells break light down into ATP energy. C) The process by which cells communicate with other cells. D) None of above. Show Answer Correct Answer: A) The process by which cells break down glucose into ATP energy. 14. The nucleotide sequence of mRNA codon is composed of how many bases? A) 2. B) 3. C) 20. D) 64. Show Answer Correct Answer: B) 3. 15. Each amino acid is different from the other due to..... A) The R group. B) The amino group. C) The carboxyl group. D) The central carbon. Show Answer Correct Answer: A) The R group. 16. What cell structure controls which materials enter or leave a cell? A) Nucleus. B) Cytoplasm. C) Cell membrane. D) Vacuole. Show Answer Correct Answer: C) Cell membrane. 17. What is the structure of the DNA during DNA replication? A) Wrapped around histones in chromatin form. B) Tightly coiled into chromosomes. C) Just as it appears in a karyotype. D) DNA has no structure during replication. Show Answer Correct Answer: A) Wrapped around histones in chromatin form. 18. DNA has a ..... strand; RNA has a ..... strand. A) Double/double. B) Double/triple. C) Double/single. D) Single/single. Show Answer Correct Answer: C) Double/single. 19. A small molecule that binds to the repressor and makes it inactive is A) Corepressor. B) Inducer. C) Promoter. D) Operator. Show Answer Correct Answer: B) Inducer. 20. Which of the following takes part in receptor mediated endocytosis A) Carrier protein. B) Caspase. C) Coated vesicles. D) None of above. Show Answer Correct Answer: C) Coated vesicles. ← PreviousNext →Related 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 9Molecular Biology Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books