This quiz works best with JavaScript enabled. Home > Agriculture > Biology > Molecular > Molecular Biology – Quiz 23 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 23 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which scientists determined that DNA was a double helix? A) Franklin & Watkins. B) Watson & Crick. C) Hershey & Chase. D) Meselson & Stahl. Show Answer Correct Answer: B) Watson & Crick. 2. T5 - What role does the tumor suppressor gene play in the cell cycle/cancer prevention? A) It allows cell division to occur indefinitely if there is an error in the cell cycle. B) It stops the division of the cell until errors can be corrected. C) It plays no role in cancer prevention. D) It prevents tumors by allowing the cell to continue with cell division. Show Answer Correct Answer: B) It stops the division of the cell until errors can be corrected. 3. The genetic code is A) Unique in each species. B) Redundant. C) Ambiguous. D) Uncommon. Show Answer Correct Answer: B) Redundant. 4. RNA transcript grow in which direction A) 5' end. B) 3' end. C) 5' - 3'. D) 3' - 5'. Show Answer Correct Answer: B) 3' end. 5. Which nutrients most likely support a healthy BMI (body mass index)? A) Protein, water, and unsaturated fat. B) Water, saturated fat, and cholesterol. C) Unsaturated fat, simple sugars, and complex carbohydrates. D) None of above. Show Answer Correct Answer: A) Protein, water, and unsaturated fat. 6. Which process is used in polymerase chain reaction (PCR)? A) Replication. B) Transcription. C) Translation. D) Mutation. Show Answer Correct Answer: A) Replication. 7. These chemical tags inactivate or silence a gene. A) Histones. B) Acetyl groups. C) Methyl groups. D) Genes. Show Answer Correct Answer: C) Methyl groups. 8. The molecule that is made by using a section of the nuclear DNA as a template is A) RRNA. B) RNA polymerase. C) MRNA. D) TRNA. Show Answer Correct Answer: C) MRNA. 9. Which statement is a part of the cell theory? A) All cells come from pre-existing cells. B) Cells bacteria are prokaryotic. C) Eukaryotic cells are complex. D) Humans are multicellular. Show Answer Correct Answer: A) All cells come from pre-existing cells. 10. What type of bond holds the two sides of a DNA molecule together? A) Polypeptide bonds. B) Peptide bonds. C) Ionic bonds. D) Hydrogen bonds. Show Answer Correct Answer: D) Hydrogen bonds. 11. More than one double bond A) Unsaturated fatty acid. B) Monounsaturated fatty acid. C) Polyunsaturated fatty acid. D) Polysaccharides. Show Answer Correct Answer: C) Polyunsaturated fatty acid. 12. If an mRNA molecule has introns and exons in it, where is it? A) At a ribosome. B) In the rough ER. C) In the nucleus. D) Could be in the nucleus or the ribosome. Show Answer Correct Answer: C) In the nucleus. 13. GENERAL: What kind of organic molecule is DNA? A) Protein. B) Carbohydrate. C) Lipid. D) Nucleic Acid. Show Answer Correct Answer: D) Nucleic Acid. 14. In replication, ..... DNA strands are copied and in transcription ..... DNA strands are copied. A) Only one of the, both. B) Both, only one of the. C) Both, both. D) Only one of the, only one of the. Show Answer Correct Answer: B) Both, only one of the. 15. Which type of organic molecule can exist as a single-stranded or double-stranded helical molecule? A) Nucleic acids. B) Carbohydrates. C) Lipids. D) Proteins. Show Answer Correct Answer: A) Nucleic acids. 16. WHICH MUTATION WOULD MOST LIKELY HAVE THE MOST HARMFUL EFFECT? A) A single addition. B) Insertion of a triplet. C) A single substitution. D) Deletion of a triplet. Show Answer Correct Answer: A) A single addition. 17. To catalyse a reaction, ..... bind to the ..... of enzymes. A) Substrate, active site. B) Inhibitor, active site. C) Substrate, allosteric site. D) Inhibitor, allosteric site. Show Answer Correct Answer: A) Substrate, active site. 18. What is RNA World theory? A) Single RNA strands can copy in solutions containing nucleotides without enzymes. B) RNA molecules called ribozymes have been found to catalyze many different reactions. C) RNA come first before DNA. D) Aggregates of artificially produced prebiotic molecules. Show Answer Correct Answer: A) Single RNA strands can copy in solutions containing nucleotides without enzymes. 19. Which of the following is NOT a function of mineral? A) Help the body use the other nutrients. B) Building bones. C) Providing energy. D) Building Teeth. Show Answer Correct Answer: C) Providing energy. 20. Arrangement of nucleotides in DNA can be seen by A) Ultracentrifuge. B) X-Ray crystallography. C) Light microscope. D) Electron microscope. Show Answer Correct Answer: B) X-Ray crystallography. 21. The process of making mRNA from DNA is called. A) Protein synthesis. B) Translation. C) Transcription. D) Replication. Show Answer Correct Answer: C) Transcription. 22. Building blocks of nucleic acids are A) Nucleosides. B) Nucleotides. C) Amino acids. D) Histones. Show Answer Correct Answer: B) Nucleotides. 23. Which type of diet BEST contributes to a healthy life style? A) A diet high in protein and fat. B) A diet high in fruits, vegetables, and fats. C) A diet high in carbohydrates, fruits, and vegetables. D) A diet high in fruits, vegetables, and lean protein. Show Answer Correct Answer: D) A diet high in fruits, vegetables, and lean protein. 24. If there are 6 pairs of nitrogen bases, how many nucleotides would be created? A) 1. B) 12. C) 6. D) 2. Show Answer Correct Answer: B) 12. 25. True replication of DNA is due to A) Phosphate backbone. B) Hydrogen bonding. C) Complementary base pairing rule. D) None. Show Answer Correct Answer: C) Complementary base pairing rule. 26. Saturated fats are A) Soluble at high temperatures. B) Liquid at room temperature. C) Solid at room temperature. D) Water soluble. Show Answer Correct Answer: C) Solid at room temperature. 27. The DNA nucleotide is composed of three parts. Which two components make up the nucleotide backbone? A) Ribose sugar and base. B) Ribose sugar and phosphate group. C) Nitrogen base and deoxyribose sugar. D) Deoxyribose sugar and phosphate group. Show Answer Correct Answer: D) Deoxyribose sugar and phosphate group. 28. A small molecule that binds to the repressor protein and makes it inactive is a/an ..... A) Operator. B) Promoter. C) Inducer. D) Corepressor. Show Answer Correct Answer: C) Inducer. 29. Which most accurately describes how plants and animals get the energy they need for growth and survival? A) Animals produce energy through photosynthesis, while plants produce energy through respiration. B) Molecules are broken down during photosynthesis to release stored energy. C) Animals produce energy through respiration, while plants produce energy through photosynthesis. D) Molecules are broken down during respiration to release stored energy. Show Answer Correct Answer: D) Molecules are broken down during respiration to release stored energy. 30. What is a similarity between DNA and RNA? A) Both are polymers of nucleotides. B) Both are composed of antiparallel strands. C) Both contain adenine, cytosine and thymine. D) Both contain ribose sugar. Show Answer Correct Answer: A) Both are polymers of nucleotides. ← 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