This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 14 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 14 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Hershey and Chase used a DNA-based virus for their work. How might the results have been different if they had used an RNA virus? A) With an RNA virus, neither sample would have had a radioactive pellet. B) With an RNA virus, radioactive protein would have been in the final pellet. C) With an RNA virus, radioactive RNA would have been in the final pellet. D) With an RNA virus, the protein shell would have been radioactive in both samples. Show Answer Correct Answer: C) With an RNA virus, radioactive RNA would have been in the final pellet. 2. Which of the following criteria must be fulfilled by a genetic material. A) Replication and Mutation. B) Stability. C) Express itself in the form of 'Mendelian Characters'. D) All of the above. Show Answer Correct Answer: D) All of the above. 3. On the lagging strand of DNA, the polymerase cannot just follow the DNA as it is separated. Because of this, it makes small segments called A) Okazaki fragments. B) Restriction fragments. C) Ligase. D) SSB proteins. Show Answer Correct Answer: A) Okazaki fragments. 4. During replication, the new DNA strand is synthesized A) In the 3' to 5' direction. B) From one end to the other, in the 3' to 5' or the 5' to 3' directions. C) In both the 3' to 5' and 5' to 3' directions from the replication fork. D) In the 5' to 3' direction. Show Answer Correct Answer: D) In the 5' to 3' direction. 5. RNA primase is used show where DNA polymerase III is to attach to add nucleotides on the exposed lagging strand. What is the name of the promoter strand on the DNA lagging strand called? A) Telomere. B) TATA box. C) Primer. D) Topoisomerase. Show Answer Correct Answer: B) TATA box. 6. True replication of DNA is possible due to A) Complementary base pairing rule. B) Hydrogen bonding. C) Phosphate backbone. D) None of the above. Show Answer Correct Answer: A) Complementary base pairing rule. 7. The base pairs of DNA double helix is given below. Select the suitable mRNA strand that derived from transcription is 3 '-ATTTCC-5'5'-TAAAGG-3' A) CCUUUC. B) GAAAGG. C) CUUUCC. D) UAAAGG. Show Answer Correct Answer: D) UAAAGG. 8. Operon unit consists of A) Regulator, operator and repressive genes. B) Regulator, structural & operator gene. C) Regulator, structural, operator & promoter gene. D) Regulator, structural & promotor. Show Answer Correct Answer: C) Regulator, structural, operator & promoter gene. 9. Which of the following forms a base pair with thymine? A) Deoxyribose. B) Adenine. C) Guanine. D) CytosineTagsDNA Structure. Show Answer Correct Answer: B) Adenine. 10. The result of which of the following experiments carried out by Avery et al on Streptococcus pnuemoniae has proved conclusively that DNA is the genetic material? A) Live R strain+ DNA from S strain+ RNAse. B) Live R strain+ DNA from S strain+ DNase. C) Heat killed R strain + DNA from S strain + RNase. D) Live R strain + DNA from S strain + protease. Show Answer Correct Answer: B) Live R strain+ DNA from S strain+ DNase. 11. Nitrogenous bases are joined by which type of bond? A) Polar bonds. B) Ionic bonds. C) Covalent bonds. D) Hydrogen bonds. Show Answer Correct Answer: D) Hydrogen bonds. 12. Site where replication begins A) Polymerase action site. B) Replication fork. C) Replication Origin. D) In the front. Show Answer Correct Answer: C) Replication Origin. 13. The human genome consists of over ..... base pairs. A) 1 million. B) 3 billion. C) 46 billion. D) 3.6 million. Show Answer Correct Answer: B) 3 billion. 14. Which of the following structural characteristics is most critical for the association between histones and DNA? A) Histones are positively charged. B) Histones are small proteins. C) There are at least five different histone proteins in every eukaryote. D) Histones are highly conserved (that is, histones are very similar in every eukaryote). Show Answer Correct Answer: A) Histones are positively charged. 15. Name the enzyme which can stop the bacterial transformation A) RNases. B) DNase. C) Lipases. D) DNAs. Show Answer Correct Answer: B) DNase. 16. Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it? A) Thymine, Uracil-Pyrimidines. B) Uracil, Cytosine-Pyrimidines. C) Guanine, Adenine-Purines. D) Adenine, Thymine-Purines. Show Answer Correct Answer: D) Adenine, Thymine-Purines. 17. Why might a point mutation in DNA make a difference in the level of a protein's activity? A) It might substitute a different amino acid in the active site. B) It might result in a chromosomal translocation. C) It might exchange one serine codon for a different serine codon. D) It might exchange one stop codon for another stop codon. Show Answer Correct Answer: A) It might substitute a different amino acid in the active site. 18. Which enzyme seals okazaki fragments together on the lagging strand? A) Topoisomerase. B) Helicase. C) Polymerase. D) Ligase. Show Answer Correct Answer: D) Ligase. 19. 'DNA is more stable than RNA', which of these options support this statement. A) Due to chemical modifications. B) Double stranded structure with complementary strand. C) Evolved a process of repair. D) All of the above. Show Answer Correct Answer: D) All of the above. 20. Which of the following steps in transcription is catalysed by RNA polymerse? A) Initiation. B) Elongation. C) Termination. D) All of these. Show Answer Correct Answer: B) Elongation. 21. Control of gene expression takes place at the level of: A) Translation. B) Transcription. C) None of the above. D) DNA-replication. Show Answer Correct Answer: B) Transcription. 22. RNA can act as an enzyme in some organisms. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 23. Largest gene in human is A) Oncogene. B) Tumour suppressing gene. C) Dystrophin. D) Insulin. Show Answer Correct Answer: C) Dystrophin. 24. Purines include A) Adenine & Guanine. B) Cytosine & Thymine. C) Uracil & Cytosine. D) Thymine & Uracil. Show Answer Correct Answer: A) Adenine & Guanine. 25. Each mRNA codon codes for ..... A) A protein. B) An amino acid. C) A carbohydrate. D) An enzyme. Show Answer Correct Answer: B) An amino acid. ← PreviousNext →Related QuizzesClass 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 1Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 2Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 3Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 4Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 5Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 6Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 7Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 8Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 9Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books