This quiz works best with JavaScript enabled. Home > Agriculture > Biology > Molecular > Molecular Biology – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 11 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In eukaryotic cells, transcription cannot begin until A) The two DNA strands have completely separated and exposed the promoter. B) Several transcription factors have bound to the promoter. C) The 5' caps are removed from the mRNA. D) The DNA introns are removed from the template. Show Answer Correct Answer: B) Several transcription factors have bound to the promoter. 2. What happens in Inversion? A) Its repeated. B) They all get deleted. C) A section of the chromosome gets flipped. D) They start to cross-over. Show Answer Correct Answer: C) A section of the chromosome gets flipped. 3. In what phase of the cell cycle does DNA replication take place? A) M. B) S. C) G2. D) G1. Show Answer Correct Answer: B) S. 4. Describes the twisted ladder-like shape of a DNA molecule A) Nitrogen Base. B) Hexagon. C) Double Helix. D) None of above. Show Answer Correct Answer: C) Double Helix. 5. Ligases are the glue of biotechnology. What enzymes act like scissors? A) Restriction enzymes. B) Primase. C) Polymerases. D) Helicases. Show Answer Correct Answer: A) Restriction enzymes. 6. The reactants of photosynthesis are A) Sugar and water. B) Sugar and oxygen. C) Carbon dioxide and water. D) Carbon dioxide and oxygen. Show Answer Correct Answer: C) Carbon dioxide and water. 7. Gel electrophoresis sorts DNA molecules on the basis of their.. A) Solubility in water. B) Solubility in the gel. Solubility in the gel. C) Ability to bind to mRNA. D) Size. Show Answer Correct Answer: D) Size. 8. Which is a difference between DNA and RNA A) RNA is double stranded. B) RNA is not made of nucleotides. C) RNA contains Uracil instead of Thymine. D) RNA does not contain a sugar. Show Answer Correct Answer: C) RNA contains Uracil instead of Thymine. 9. How would the absence of sunlight affect a plant's ability to grow? A) The plant could not absorb nutrients from soil. B) The plant could not absorb water from the soil. C) The plant could not produce carbon dioxide and oxygen. D) The plant could not produce food through photosynthesis. Show Answer Correct Answer: D) The plant could not produce food through photosynthesis. 10. Transcription happens in the ..... and Translation happens in the ..... A) Nucleus, cytoplasm. B) Nucleus, nucleus. C) Ribosome, nucleus. D) Cytoplasm, nucleus. Show Answer Correct Answer: A) Nucleus, cytoplasm. 11. Which scientist(s) made an x-ray diffraction photo of DNA? A) Rosalind Franklin. B) Watson and Crick. C) Charles Darwin. D) Erwin Chargaff. Show Answer Correct Answer: A) Rosalind Franklin. 12. 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. 13. What is the gel-like substance inside of cells called? A) Cytoplasm. B) Photosynthesis. C) Cytoskeleton. D) Photoplasm. Show Answer Correct Answer: A) Cytoplasm. 14. Which refers to the breakdown of macromolecules into simpler building blocks? A) Metabolism. B) Condensation. C) Anabolism. D) Catabolism. Show Answer Correct Answer: D) Catabolism. 15. 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) Okazaki fragments. B) Primase. C) DNA ligase. D) DNA polymerase. Show Answer Correct Answer: C) DNA ligase. 16. Enzymes are classified as which of the following biological organic compounds? A) Nucleic acids. B) Proteins. C) Lipids. D) Carbohydrates. Show Answer Correct Answer: B) Proteins. 17. A mutation is defined as: A) A change in the DNA sequence. B) A change in the cell's structure. C) Any change in the physical features of a human. D) Anything that changes in an embryo. Show Answer Correct Answer: A) A change in the DNA sequence. 18. Which is the primary molecule in the cell that is broken down to get energy? A) Water. B) Sugar. C) Protein. D) Salt. Show Answer Correct Answer: B) Sugar. 19. This nucleic acid is single stranded A) DNA. B) RNA. C) Both. D) None of above. Show Answer Correct Answer: B) RNA. 20. Codons contain ..... bases A) 1. B) 9. C) 3. D) 6. Show Answer Correct Answer: C) 3. 21. This is a sequence of nucleotides from a section of mRNA.AUGAAACGCACGCAGFrom which DNA sequence has it been transcribed? A) TACTTTGCGTGCGTC. B) UACUUUGCGUGCGAC. C) TACUUUGCGTGCGTC. D) ATGAAACGCACGCAG. Show Answer Correct Answer: A) TACTTTGCGTGCGTC. 22. In gene regulation a gene is "turned on" by a(n) A) Stimulator. B) Promoter. C) Activator. D) Repressor. Show Answer Correct Answer: C) Activator. 23. When DNA is transcribed to RNA..... A) C pairs with U. B) A pairs with U. C) A pairs with T. D) C pairs with T. Show Answer Correct Answer: B) A pairs with U. 24. 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. 25. What type of bond is formed when correct base pairs come together? A) Covalent bonds. B) Ionic bonds. C) Sulphur bonds. D) Hydrogen bonds. Show Answer Correct Answer: D) Hydrogen bonds. 26. How many codons are needed to specify for five amino acids? A) 5. B) 15. C) 30. D) 3. Show Answer Correct Answer: A) 5. 27. 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. 28. Which enyzme would be found only on the lagging strand? A) Ligase. B) Topoisomerase. C) DNA polymerase. D) Primase. Show Answer Correct Answer: A) Ligase. 29. How many amino acids can be represented by a single 3-base DNA sequence? A) 8. B) 3. C) 6. D) 1. Show Answer Correct Answer: D) 1. 30. What enzyme builds the mRNA strand during transcription? A) DNA polymerase. B) RNA polymerase. C) Primase. D) Helicase. Show Answer Correct Answer: B) RNA polymerase. ← 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