This quiz works best with JavaScript enabled. Home > Biology > Molecular Biology – Quiz 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Molecular Biology Quiz 13 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which enzyme bonds together the Okazaki fragments in the lagging strand? A) Helicase. B) Polymerase. C) Ligase. D) Primerase. Show Answer Correct Answer: C) Ligase. 2. Which organic molecule contains phosphorus? A) Carbohydrate. B) Lipid. C) Protein. D) Nucleic acid. Show Answer Correct Answer: D) Nucleic acid. 3. The elongation of the leading strand during DNA synthesis A) Progresses away from the replication fork. B) Occurs in the 3' to 5' direction. C) Produces Okazaki fragments. D) Depends on the action of DNA polymerase. Show Answer Correct Answer: D) Depends on the action of DNA polymerase. 4. The main function of tRNA is to..... A) Carry a message that, when translated, forms proteins. B) Form a portion of ribosomes. C) String together complementary RNA and DNA strands. D) Bring amino acids from the cytoplasm to the ribosomes. Show Answer Correct Answer: D) Bring amino acids from the cytoplasm to the ribosomes. 5. 10 $\mu$g is equivalent to ..... mg. A) $10.0 \times 10^3 $. B) 0.1. C) 0.01. D) 1000. Show Answer Correct Answer: C) 0.01. 6. Which would be MOST beneficial to an individual suffering from heart disease? A) Eating foods with a high calorie content. B) Drinking a glass of fruit juice with every meal. C) Walking on a treadmill for 30 minutes every day. D) Playing Fortnite for 6 hours a day. Show Answer Correct Answer: C) Walking on a treadmill for 30 minutes every day. 7. Chargaff's rules for pairing of nitrogen bases is A) A=C and G=T. B) A pairs with T and G pairs with C. C) A pairs with G and C pairs with T. D) A pairs with C and G pairs with T. Show Answer Correct Answer: B) A pairs with T and G pairs with C. 8. The base sequence of a fragment of DNA is:ACC GTG CAG GATWhat is the base sequence on the messenger RNA (mRNA) molecule transcribed from it? A) UGG CTC GUC CUT. B) TGG CAC GTC CTA. C) TGG CUC GTC CTU. D) UGG CAC GUC CUA. Show Answer Correct Answer: D) UGG CAC GUC CUA. 9. What is the composition of nucleoside? A) A sugar + a phosphate. B) A base + a sugar. C) A base + a phosphate. D) A base + a sugar + phosphate. Show Answer Correct Answer: B) A base + a sugar. 10. PCR technique was invented by A) Karry Mullis. B) Boyer. C) Sanger. D) Cohn. Show Answer Correct Answer: A) Karry Mullis. 11. STRUCTURE: Which 2 molecules form the sides of the DNA ladder? A) Deoxyribose and adenine. B) Deoxyribose and a hydrogen bond. C) Sugar and the nucleus. D) Deoxyribose (sugar) and phosphate. Show Answer Correct Answer: D) Deoxyribose (sugar) and phosphate. 12. Crick and Watson elucidated the structure of DNA using which of the following? A) Model making. B) Gel Electrophoresis. C) X-ray crystallography. D) Condensation reactions. Show Answer Correct Answer: A) Model making. 13. In prokaryotes, DNA molecules are located in the A) Nucleus. B) Ribosomes. C) Cytoplasm. D) Histones. Show Answer Correct Answer: C) Cytoplasm. 14. A gene gives the instructions for protein synthesis. Which type of molecule is responsible for "reading" the instructions and then creating the protein? A) ATP. B) RNA. C) DDT. D) DNA. Show Answer Correct Answer: B) RNA. 15. The following strand of DNA is transcribed:51 TGA ACT GCT 31What will be the second codon of the mRNA formed from transcription? A) AGU. B) UGA. C) TGA. D) AGT. Show Answer Correct Answer: A) AGU. 16. A frameshift mutation could result from A) A base insertion only. B) A base deletion only. C) A base substitution only. D) Either an insertion or a deletion of a base. Show Answer Correct Answer: D) Either an insertion or a deletion of a base. 17. Which best explains why organisms need food? A) Food is the source of energy required for growth and repair of tissues. B) Food provides the raw materials for producers to produce more food. C) Food is the source of water needed to hydrate the surface of cells. D) Food provides the oxygen necessary for plant and animal survival. Show Answer Correct Answer: A) Food is the source of energy required for growth and repair of tissues. 18. In his work with pneumonia-causing bacteria & mice, Griffith found that A) The protein coat from pathogenic cells was able to transform nonpathogenic cells. B) Heat-killed pathogenic cells caused pneumonia. C) Some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic. D) The polysaccharide coat of bacteria caused pneumonia. Show Answer Correct Answer: C) Some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic. 19. Which pair of nitrogen bases are correctly matched? A) Adenine with cytosine. B) Adenine with thymine. C) Cytosine with thymine. D) Guanine with adenine. Show Answer Correct Answer: B) Adenine with thymine. 20. The artificial production of which substance (normally produced by living organisms) helped disprove vitalism? A) Urea. B) Urine. C) Uric acid. D) Ammonia. Show Answer Correct Answer: A) Urea. ← 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