This quiz works best with JavaScript enabled. Home > Biology > Molecular Biology – Quiz 42 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 42 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the difference between DNA and RNA A) DNA has uracil and RNA has thymine. B) DNA is involved in transcription and RNA is involved in translation. C) DNA contains thymine and RNA contains uracil. D) DNA is made of nucleotides and RNA is not. Show Answer Correct Answer: C) DNA contains thymine and RNA contains uracil. 2. This organelle can produce up to 36 ATP per molecule of sugar A) Chloroplasts. B) Bacteria. C) Lysosomes. D) Mitochondria. Show Answer Correct Answer: D) Mitochondria. 3. What is the source of most food energy? A) Soil. B) Wind. C) Water. D) Sunlight. Show Answer Correct Answer: D) Sunlight. 4. Avery et. al experiment proved ..... was the genetic material. A) DNA. B) Protein. C) Didn't give a conclusion. D) Phosphate group. Show Answer Correct Answer: A) DNA. 5. If a messenger RNA codon is UAC, which of the following would be the complementary anticodon triplet in the transfer RNA? A) ATG. B) AUC. C) AUG. D) ATT. Show Answer Correct Answer: C) AUG. 6. In replication, DNA ..... "unzips" the DNA molecule A) Polymerase. B) Phages. C) Helicase. D) Bonds. Show Answer Correct Answer: C) Helicase. 7. 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. 8. The gene product is ..... A) Promoter, Operator, Gene, Terminator. B) Polypeptide Chain. C) DNA. D) Oncogenes. Show Answer Correct Answer: B) Polypeptide Chain. 9. Which enzyme seals okazaki fragments together on the lagging strand? A) Topoisomerase. B) Helicase. C) Polymerase. D) Ligase. Show Answer Correct Answer: D) Ligase. 10. What is the name of this: DNA --> DNA? A) Translation. B) Replication. C) Transcription. D) None of these. Show Answer Correct Answer: B) Replication. 11. Plasmids are used as cloning vectors for which of the following reasons? A) Can be multiplied in culture. B) Self-replication in bacterial cells. C) Can be multiplied in laboratories with the help of enzymes. D) Replicate freely outside bacterial cells. Show Answer Correct Answer: B) Self-replication in bacterial cells. 12. 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) Application of more insecticides on the crops. B) Introduction of an insecticidal gene from another organism into corn. C) Introduction of wasps that can feed on this pest in the cornfields. D) Cultivation of more corn seeds to combat the lower production. Show Answer Correct Answer: B) Introduction of an insecticidal gene from another organism into corn. 13. 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. 14. All single bonds between carbons A) Cis or trans isomers. B) Monounsaturated fatty acid. C) Polyunsaturated fatty acid. D) Saturated fatty acid. Show Answer Correct Answer: D) Saturated fatty acid. 15. 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. 16. 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 with the plasmid. B) Growth in ampicillin agar by bacteria with the plasmid. C) Growth in ampicillin agar by bacteria without plasmid. D) Growth in agar without the ampicillin by bacteria without the plasmid. Show Answer Correct Answer: B) Growth in ampicillin agar by bacteria with the plasmid. 17. 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. 18. 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. 19. 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. 20. The property of water that results in water molecules "sticking" to other charged or polar molecules is A) Cohesion. B) Adhesion. C) High specific heat. D) High heat of fusion. Show Answer Correct Answer: B) Adhesion. ← 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