This quiz works best with JavaScript enabled. Home > Agriculture > Biology > Molecular > Molecular Biology – Quiz 28 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 28 (30 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If a messenger RNA codon is UAC, which of the following would be the complementary anticodon triplet in the transfer RNA? A) AUG. B) ATG. C) AUC. D) ATT. Show Answer Correct Answer: A) AUG. 2. In replication, DNA ..... "unzips" the DNA molecule A) Phages. B) Polymerase. C) Bonds. D) Helicase. Show Answer Correct Answer: D) Helicase. 3. What are the necessary inducer to start the transcription in prokaryotes? A) Sigma factor and holoenzyme. B) Haloenzyme. C) Sigma factor and core enzyme. D) RNA polymerase. Show Answer Correct Answer: C) Sigma factor and core enzyme. 4. The gene product is ..... A) Polypeptide Chain. B) DNA. C) Promoter, Operator, Gene, Terminator. D) Oncogenes. Show Answer Correct Answer: A) Polypeptide Chain. 5. Which enzyme seals okazaki fragments together on the lagging strand? A) Helicase. B) Topoisomerase. C) Ligase. D) Polymerase. Show Answer Correct Answer: C) Ligase. 6. What is the name of this: DNA --> DNA? A) Translation. B) Replication. C) Transcription. D) None of these. Show Answer Correct Answer: B) Replication. 7. Plasmids are used as cloning vectors for which of the following reasons? A) Replicate freely outside bacterial cells. B) Self-replication in bacterial cells. C) Can be multiplied in culture. D) Can be multiplied in laboratories with the help of enzymes. Show Answer Correct Answer: B) Self-replication in bacterial cells. 8. The European corn borer is a major pest that causes corn to produce smaller ears, broken stalks, and drooped ears and sometimes even results in early death of the plant. What can be a use of biotechnology in providing an effective control against this pest? A) Cultivation of more corn seeds to combat the lower production. B) Application of more insecticides on the crops. C) Introduction of wasps that can feed on this pest in the cornfields. D) Introduction of an insecticidal gene from another organism into corn. Show Answer Correct Answer: D) Introduction of an insecticidal gene from another organism into corn. 9. When Wohler synthesised urea, it falsified which theory? A) Creationism. B) Vitalism. C) Spontaneous generation. D) None of the above. Show Answer Correct Answer: B) Vitalism. 10. All single bonds between carbons A) Polyunsaturated fatty acid. B) Monounsaturated fatty acid. C) Saturated fatty acid. D) Cis or trans isomers. Show Answer Correct Answer: C) Saturated fatty acid. 11. Which of the following organic molecules is correctly matched with its functions? A) Nucleic acids provide structure for cell organelles. B) Lipids are a primary component of cell membranes. C) Proteins are the primary energy source during metabolism. D) Carbohydrates help store and transmit genetic information. Show Answer Correct Answer: B) Lipids are a primary component of cell membranes. 12. You have given bacteria a plasmid with an ampicillin resistance gene. Which of the following results would indicate that transformation of the bacteria occurred? A) Growth in agar without the ampicillin by bacteria without the plasmid. B) Growth in ampicillin agar by bacteria without plasmid. C) Growth in ampicillin agar by bacteria with the plasmid. D) Growth in agar without the ampicillin by bacteria with the plasmid. Show Answer Correct Answer: C) Growth in ampicillin agar by bacteria with the plasmid. 13. When a ..... reaches its ....., there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called ..... . A) Signaling molecule; receptor; G proteins. B) Signaling molecule; target cell; G proteins. C) Signaling molecule; target cell; receptors. D) None of above. Show Answer Correct Answer: C) Signaling molecule; target cell; receptors. 14. The way or process the body uses food for energy, maintenance, and growth. A) Fun. B) Nutrition. C) Exercise. D) Vitamins. Show Answer Correct Answer: B) Nutrition. 15. A molecule of DNA is made up of ..... A) Amino acids and proteins. B) ATP and enzymes. C) Paired nucleotides. D) Receptor enzymes. Show Answer Correct Answer: C) Paired nucleotides. 16. The property of water that results in water molecules "sticking" to other charged or polar molecules is A) Cohesion. B) Adhesion. C) High heat of fusion. D) High specific heat. Show Answer Correct Answer: B) Adhesion. 17. MRNA is shorter than hnRNA due to A) Polyadenylation. B) Transcription. C) Capping. D) Splicing. Show Answer Correct Answer: D) Splicing. 18. Provides energy to the cell by transforming food into ATP A) Chloroplast. B) Mitochondria. C) Cell membrane. D) Nucleus. Show Answer Correct Answer: B) Mitochondria. 19. How many moles of KI are present in 0.85 L of a 0.55 M KI solution? A) 3.10 mols. B) 1.55 mols. C) 0.4675 mols. D) 0.935 mols. Show Answer Correct Answer: C) 0.4675 mols. 20. Which activity would supply the MOST oxygen to the body for digestion and respiration? A) Running. B) Sit-ups. C) Stretching. D) Lifting weights. Show Answer Correct Answer: A) Running. 21. A frameshift mutation is caused by an insertion or A) Translocation. B) Inversion. C) Deletion. D) Diversion. Show Answer Correct Answer: C) Deletion. 22. HISTORY: Took the X-Ray crystallography photographs that revealed that DNA is a Double Helix A) Fredrick Griffeth. B) Martha Chase. C) Linnus Pauling. D) Rosalind Franklin. Show Answer Correct Answer: D) Rosalind Franklin. 23. What is the verb form of the word "transcription" A) To translate. B) To transcribe. C) To transcript. D) To excise. Show Answer Correct Answer: B) To transcribe. 24. Enzyme that unwinds the DNA A) DNA Polymerase. B) Helicase. C) Primase. D) Ligase. Show Answer Correct Answer: B) Helicase. 25. What is the function of the mitochondria? A) Structure that manufactures ribosomes. B) Structures that converts molecules to ATP energy. C) Stack of membranes that packages chemicals. D) Structure that contains DNA and directs the cell. Show Answer Correct Answer: B) Structures that converts molecules to ATP energy. 26. Enzyme that breaks hydrogen bonds (unzips) A) Ligase. B) Helicase. C) Polymerase. D) Primase. Show Answer Correct Answer: B) Helicase. 27. In prokaryotes, DNA is located in the A) Cytoplasm. B) Cell membrane. C) Nucleus. D) Ribosome. Show Answer Correct Answer: A) Cytoplasm. 28. Alternative RNA splicing ..... A) Is a mechanism for increasing the rate of translation. B) Can allow the production of proteins of different sizes and functions from a single mRNA. C) Can allow the production of similar proteins from different RNAs. D) Increases the rate of transcription. Show Answer Correct Answer: B) Can allow the production of proteins of different sizes and functions from a single mRNA. 29. A substance that can cause a change in the DNA code of an organism is called a A) Toxin. B) Mutagen. C) Nitrogenous base. D) Nucleotide. Show Answer Correct Answer: B) Mutagen. 30. What does the DNA of a typical prokaryotic cell look like? A) DNA is found in the nucleus in a single circular chromosome. B) DNA is found in the nucleus as a single X-shaped chromosome. C) DNA is found in the cytoplasm as a single X-shaped chromosome. D) DNA is found in the cytoplasm as a single circular chromosome. Show Answer Correct Answer: D) DNA is found in the cytoplasm as a single circular chromosome. ← 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