This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 19 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 19 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Synthesis of DNA from RNA is explained by: A) Central dogma reverse. B) Reverse transcription. C) Feminism. D) All of these. Show Answer Correct Answer: B) Reverse transcription. 2. Nucleotide base present in DNA and not in RNA is A) Cytosine. B) Thymine. C) Uracil. D) Guanine. Show Answer Correct Answer: B) Thymine. 3. Which site of the tRNA pairs through hydrogen bonding with the triplet codon on mRNA? A) Codon. B) 5' end of tRNA. C) 3' end of tRNA. D) Anticodon. Show Answer Correct Answer: D) Anticodon. 4. Which enzyme unwinds the DNA double helix at the replication fork to create single-stranded templates? A) Topoisomerase. B) Ligase. C) Helicase. D) Primase. Show Answer Correct Answer: C) Helicase. 5. The DNA dependent DNA polymerase catalysepolymerisation in A) 3' 5' direction. B) 5' 3' direction. C) Depend on the nature of template strand. D) Both (1) & (2. Show Answer Correct Answer: B) 5' 3' direction. 6. What is the LAST step of the completion of DNA replication? A) Telomeres are added to ends of DNA. B) Ligase glues Okazaki fragments. C) DNA polymerase proofreads. D) Topoisomerase relieves supercoilingTagsDNA replication process. Show Answer Correct Answer: A) Telomeres are added to ends of DNA. 7. Assertion:Transcription is the mode in which DNA passes its genetic information to RNA. Reason:Transcription takes place in the cytoplasm of eukaryotic cells. A) Both assertion and reason are true and the reason is the correct explanation of assertion. B) Both assertion and reason are true but the reason is not the correct explanation of assertion. C) Assertion is true but reason is false. D) Both assertion and reason are false. Show Answer Correct Answer: C) Assertion is true but reason is false. 8. DNA replication in E.coli is A) Conservative and unidirectional. B) Semi conservative and unidirectional. C) Conservative and bidirectional. D) Semi-conservative and bidirectional. Show Answer Correct Answer: D) Semi-conservative and bidirectional. 9. Which of the following is true of DNA but not of RNA? A) It is made up of a single strand of nucleotides. B) It contains the sugar deoxyribose. C) It leaves the nucleus to translate protein. D) It contains the nitrogen base uracil. Show Answer Correct Answer: B) It contains the sugar deoxyribose. 10. The experiments of Meselson and Stahl showed that DNA ..... A) Replicates in a semiconservative fashion. B) Is composed of nucleotides. C) Is the genetic material. D) Contains complementary base pairing. Show Answer Correct Answer: A) Replicates in a semiconservative fashion. 11. In DNA promoter is the site for the initiation of A) Replication. B) Translation. C) Transcription. D) Both (2) & (3). Show Answer Correct Answer: C) Transcription. 12. Enzyme DNA polymerases catalyze polymerization in A) Ribonucleotides. B) Deoxyribonucleosides. C) 3'-5' direction. D) 5'-3' direction. Show Answer Correct Answer: D) 5'-3' direction. 13. Okazaki Fragments are A) Short DNA fragments on the lagging strand. B) Short DNA fragments on the leading strand. C) The RNA primer required for the initiation of DNA synthesis. D) The DNA fragment produced due to radiation action. Show Answer Correct Answer: A) Short DNA fragments on the lagging strand. 14. In Meselson and Stahl's experiment, ..... generation(s) after cells were transferred from heavy-nitrogen medium to light nitrogen medium, half of the DNA was of hybrid density. A) I generation. B) II generation. C) III generation. D) IV generation. Show Answer Correct Answer: B) II generation. 15. The three codons which result in the termination of polypeptide chain synthesis are: A) UAA, UAG, GUA. B) UAA, UAG, UGA. C) UAA, UGA, UUA. D) UGU, UAG, UGA. Show Answer Correct Answer: B) UAA, UAG, UGA. 16. What does the base 'G' pair with? A) A. B) T. C) C. D) G. Show Answer Correct Answer: C) C. 17. Where translation takeplace A) Ribosome. B) Nucleus. C) Cytoplasm. D) Mitochondria. Show Answer Correct Answer: C) Cytoplasm. 18. Identify the type of RNA which is not involved in gene expression A) RRNA. B) MRNA. C) TRNA. D) HnRNA. Show Answer Correct Answer: D) HnRNA. 19. Which of these is not the step involved transcription A) Initiation. B) Elongation. C) Termination. D) Insertion. Show Answer Correct Answer: D) Insertion. 20. Which of the following techniques was most helpful to Watson and Crick in developing their model for the structure of DNA? A) Radioactive labeling. B) Electrophoresis. C) Cloned DNA. D) X-ray crystallography. Show Answer Correct Answer: D) X-ray crystallography. 21. What would happen if in a genre encoding a polypeptide of 50 amino acids, 25th codon (UAU) Is mutated to UAA? A) A polypeptide of 25 amino acids will be formed. B) A polypeptide of 24 amino acids will be formed. C) Two polypeptide of 24 and 25 amino acids will be formed. D) A polypeptide of 49 amino acids will be formed. Show Answer Correct Answer: B) A polypeptide of 24 amino acids will be formed. 22. What is meant by the term 'transformation' in the context of DNA as the genetic material? A) The process by which DNA is transferred from one organism to another. B) The change in the structure of DNA within a cell. C) All the above. D) None of the above. Show Answer Correct Answer: A) The process by which DNA is transferred from one organism to another. 23. TRNA is present corresponding to each of the following specified codons, except the codon A) UUU. B) UGG. C) AUG. D) UGA. Show Answer Correct Answer: D) UGA. 24. The leading strand and lagging strand in DNA replication differ in that only on the lagging strand A) DNA is replicated as short fragments. B) RNA primer is present. C) Replication proceeds in the 5' to 3' direction. D) Okazaki fragments are not needed. Show Answer Correct Answer: A) DNA is replicated as short fragments. 25. Chargaff contributed to the understanding of DNA by figuring out that the percentages of adenine and cytosine were almost equal in any sample of DNA. A) True. B) FalseTagsDNA replication experimentschargaff. C) All the above. D) None of the above. Show Answer Correct Answer: B) FalseTagsDNA replication experimentschargaff. ← 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