This quiz works best with JavaScript enabled. Home > Agriculture > Biology > Molecular > Molecular Biology – Quiz 38 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 38 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which enzyme is responsible for proofreading the newly composed DNA strand? A) Primase. B) Topoisomerase. C) DNA Polymerase. D) Ligase. Show Answer Correct Answer: C) DNA Polymerase. 2. A disease caused by a mutation in one or a few genes is referred to as a(n) A) Genetic disorder. B) Malfunction. C) Inheritance. D) None of above. Show Answer Correct Answer: A) Genetic disorder. 3. Which part of the cell is often called "the brain of the cell"? A) Nuclear membrane. B) Nucleus. C) Endoplasmic reticulum. D) Mitochondria. Show Answer Correct Answer: B) Nucleus. 4. All eukaryotes and prokaryotes are surrounded by a ..... A) Cell wall. B) Cell membrane. C) Cell envelope. D) Nucleus. Show Answer Correct Answer: B) Cell membrane. 5. Which is NOT a disaccharide? A) Galactose. B) Maltose. C) Sucrose. D) Lactose. Show Answer Correct Answer: A) Galactose. 6. In 1828, Friedrich Wohler artificially produced urea (organic compound) by an internal rearrangement of the atoms of ammonium cyanate (inorganic compound). What important principle did this experiment show? A) Vitalism. B) Organic compounds can be synthesised without the need of a vital force. C) Organic compounds are simpler substances than inorganic compounds. D) Inorganic compounds are essential for living organisms. Show Answer Correct Answer: B) Organic compounds can be synthesised without the need of a vital force. 7. Anything in the environment that causes a mutation is a(n) A) Mutagen. B) Elongation. C) Frameshift. D) Splicing. Show Answer Correct Answer: A) Mutagen. 8. ..... proved that DNA replicates by semiconservative replication. A) Hershey and Chase. B) Griffith. C) Messelson and Stahl. D) Franklin. Show Answer Correct Answer: C) Messelson and Stahl. 9. Intervening sequences. Do not code for any protein. Are removed during RNA processing. Found in eukaryotic DNA; not present in bacterial DNA. A) Introns. B) Exons. C) Spliceosomes. D) None of above. Show Answer Correct Answer: A) Introns. 10. What is the source of the oxygen released into the air as a product of photosynthesis? A) Chlorophyll. B) Carbon dioxide only. C) Water only. D) Both water and carbon dioxide. Show Answer Correct Answer: C) Water only. 11. What property of water makes it suitable as a coolant? A) It takes a lot of energy to increase the temperature of water. B) It takes a lot of energy for water to evaporate. C) Water molecules are cohesive and stick to the skin. D) Water is a good solvent so it can transport heat from the body. Show Answer Correct Answer: B) It takes a lot of energy for water to evaporate. 12. Group of adjacent nucleotides are joined by A) Phosphodiester bond. B) Peptide bond. C) Ionic bond. D) Covalent bond. Show Answer Correct Answer: A) Phosphodiester bond. 13. If a DNA strand ACCGTCAC is used to transcribe a piece of mRNA, what would that mRNA look like? A) UCCGTCUC. B) TGGCAGTC. C) ACCGUCAC. D) UGGCAGUG. Show Answer Correct Answer: D) UGGCAGUG. 14. What is the function of the release factor in translation? A) It separates tRNA in the A site from the growing polypeptide. B) It binds to the stop codon in the A site in place of a tRNA. C) It releases the amino acid from its tRNA to allow the amino acid to form a polypeptide. D) It releases the ribosome from the ER to allow polypeptides into the cytosol. Show Answer Correct Answer: B) It binds to the stop codon in the A site in place of a tRNA. 15. Which statement best compares aerobic and anaerobic respiration? A) Less lactic acid is generated during anaerobic respiration than during aerobic respiration. B) More water is generated during anaerobic respiration than during aerobic respiration. C) More oxygen is generated during anaerobic respiration than during aerobic respiration. D) Less ATP is generated during anaerobic respiration than during aerobic respiration. Show Answer Correct Answer: D) Less ATP is generated during anaerobic respiration than during aerobic respiration. 16. Following transcription in eukaryotes, the RNA transcript A) Is processed to remove exons from the raw transcript. B) Is processed to insert exons into the raw transcript. C) Is processed to add a 5 prime cap and a 3 prime tail. D) Is processed to add a 3 prime cap and a 5 prime tail. Show Answer Correct Answer: C) Is processed to add a 5 prime cap and a 3 prime tail. 17. The enzyme that helps to remove the introns A) Splicing. B) Spliceosomes. C) SnRNA. D) SNRIP. Show Answer Correct Answer: B) Spliceosomes. 18. What suffix is commonly applied to enzymes? A) -ose. B) -ase. C) -ice. D) -ter. Show Answer Correct Answer: B) -ase. 19. Original: ATC CATMutation: ATC GCATWhat mutation occurred? A) Insertion. B) Deletion. C) Silent. D) Transverse. Show Answer Correct Answer: A) Insertion. 20. Which IS an example for Nucleic Acids? A) Fish. B) DNA/RNA. C) Grapes. D) Potato. Show Answer Correct Answer: B) DNA/RNA. 21. A difference between DNA and RNA is RNA has which of the following bases? A) Thymine. B) Adenine. C) Cytosine. D) Uracil. Show Answer Correct Answer: D) Uracil. 22. Where in the cell does DNA replication occur? A) Always the cytoplasm. B) Always the nucleus. C) In the cytoplasm in eukaryotes and the nucleus in prokaryotes. D) In the cytoplasm in prokaryotes and the nucleus in eukaryotes. Show Answer Correct Answer: D) In the cytoplasm in prokaryotes and the nucleus in eukaryotes. 23. Which is the main source of energy used in all body processes? A) Fats. B) Protein. C) Glucose. D) None of above. Show Answer Correct Answer: C) Glucose. 24. Which enzyme uncoils the DNA? A) Ligase. B) Helicase. C) Polymerase. D) Topoisomerase. Show Answer Correct Answer: D) Topoisomerase. 25. Which substance must be transported in the blood by lipoprotein complexes? A) Cholesterol. B) Sodium chloride. C) Oxygen. D) Amino acids. Show Answer Correct Answer: A) Cholesterol. 26. What happens in the Denature step of PCR? A) The DNA nucleotides are broken apart. B) The base-pairing rules for DNA are reversed. C) The double-stranded DNA is separated into two single strands of DNA. D) None of above. Show Answer Correct Answer: C) The double-stranded DNA is separated into two single strands of DNA. 27. Which activities can most effectively increase energy levels, increase respiration, and burn calories? A) Jogging. B) Napping. C) Weightlifting. D) None of above. Show Answer Correct Answer: A) Jogging. 28. When a dipeptide is formed from two amino acids which type of reaction takes place? A) Condensation reaction. B) A reaction which is catabolism. C) Hydrolysis reaction. D) Denaturing of amino acids. Show Answer Correct Answer: A) Condensation reaction. 29. Cells with a nucleus and membrane-bound organelles are called ..... A) Prokaryotes. B) Bacteria. C) Eukaryotes. D) Protists. Show Answer Correct Answer: C) Eukaryotes. 30. HISTORY: Discovered that A and T bond together and C and G bond together..... A) Watson and Crick. B) Rosalind Franklin. C) Fredrick Griffeth. D) Erwin Chargaff. Show Answer Correct Answer: D) Erwin Chargaff. ← PreviousNext →Related QuizzesBiology QuizzesAgriculture QuizzesMolecular Biology Quiz 1Molecular Biology Quiz 2Molecular Biology Quiz 3Molecular Biology Quiz 4Molecular Biology Quiz 5Molecular Biology Quiz 6Molecular Biology Quiz 7Molecular Biology Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books