This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 26 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 26 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Meselson and Stahl used ..... to label DNA. A) 3H. B) 14C. C) 15N. D) 32P. Show Answer Correct Answer: C) 15N. 2. The new DNA strand formed after DNA replication is an exact copy of its parent strand A) True. B) FalseTagsMeselson/Stahl experiment. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 3. Which of the following chromosomes has the largest genes A) 11. B) 21. C) 1. D) 24. Show Answer Correct Answer: C) 1. 4. Okazaki Fragments A) Small sections of DNA formed during discontinuous replication. B) Replication is continuous on strand. C) Replication is discontinuous on strand. D) None of the above. Show Answer Correct Answer: A) Small sections of DNA formed during discontinuous replication. 5. Introns are part of DNA which A) Code for protein synthesis. B) Do not code for protein synthesis. C) Initiate transcription. D) Help in joining pieces of DNA. Show Answer Correct Answer: B) Do not code for protein synthesis. 6. If bacterial double stranded DNA with $^{15}$N undergoes replication twice in a normal medium of nitrogen ($^{14}$N), then which of the following results A) Half contain $^{15}$N in DNA. B) All four contain $^{15}$N in DNA. C) None contains $^{15}$N in DNA. D) 1/4$^{th }$contains $^{15}$N in DNA. Show Answer Correct Answer: A) Half contain $^{15}$N in DNA. 7. RNA polymerase I in eukaryotes mainly synthesizes which RNA? A) TRNA. B) MRNA. C) RRNA (large rRNAs). D) SnRNA. Show Answer Correct Answer: C) RRNA (large rRNAs). 8. A nucleoside differs from a nucleotide. It lacks the: A) Base. B) Sugar. C) Phosphate group. D) Hydroxyl group. Show Answer Correct Answer: C) Phosphate group. 9. In the polymerization of DNA, a phosphodiester bond is formed between a phosphate group of the nucleotide being added and which of the following atoms or molecules of the last nucleotide in the polymer? A) The 3' OH. B) The 5' phosphate. C) A nitrogen from the nitrogen-containing base. D) C6. Show Answer Correct Answer: A) The 3' OH. 10. The first phase of translation is A) Recognition of DNA molecule. B) Aminoacylation of tRNA. C) Recognition of an anti-codon. D) Binding of mRNA to ribosome. Show Answer Correct Answer: B) Aminoacylation of tRNA. 11. The function of DNA polymerase I is to ..... A) Add nucleotide complements to the growing strand. B) Remove the RNA primer. C) Bond the Okazaki fragments together on the lagging strand. D) Keep the DNA strands from reforming after DNA helicase "unzips" them. Show Answer Correct Answer: B) Remove the RNA primer. 12. During replication, what enzyme adds complimentary bases? A) Helicase. B) Synthesase. C) Ligase. D) PolymeraseTagsDNA replication enzymes. Show Answer Correct Answer: D) PolymeraseTagsDNA replication enzymes. 13. Adenylyl cyclase is an enzyme that is active in the absence of A) Allolactose. B) Glucose. C) Lactose. D) CAMP. Show Answer Correct Answer: B) Glucose. 14. Polycistronic messenger RNA (mRNA) usually occurs in A) Bacteria. B) Prokaryotes. C) Eukaryotes. D) Both (a) and (b). Show Answer Correct Answer: D) Both (a) and (b). 15. A gene is a unit of inheritance. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. Hershey and Chase set out to determine what molecule served as the unit of inheritance. They completed a series of experiments in which *E. coli* was infected by a T2 virus. Which molecular component of the T2 virus actually ended up inside the cell? A) RNA. B) Ribosome. C) DNA. D) Protein. Show Answer Correct Answer: C) DNA. 17. Method of DNA replication in which two strandsof DNA separates and synthesize new strands:-(4) A) Dispersive. B) Conservative. C) Semiconservative. D) Non conservative. Show Answer Correct Answer: C) Semiconservative. 18. With respect to lac operon, product of which of the following structural gene(s) converts lactose into galactose and glucose? A) Lac Y gene. B) Lac Z gene. C) Lac A gene. D) Lac i gene. Show Answer Correct Answer: B) Lac Z gene. 19. Regions of transcriptional unit are-I) Exon II) intron III) promoter IV) structural gene V) terminator VI) cistron A) III, IV V. B) I, II & III. C) II, III & IV. D) I, II, III, IV, V. Show Answer Correct Answer: A) III, IV V. 20. During the replication of DNA, the synthesis of DNA as lagging strand takes place in segment, these segments are called A) Double helix segments. B) Satellite segments. C) Kornberg segments. D) Okazaki segments. Show Answer Correct Answer: D) Okazaki segments. 21. In the process of replication deoxyribonucleosidetriphosphate A) Acting as substrate. B) Providing energy for polymerisation reaction. C) Acting as an enzyme. D) Both (1) & (2). Show Answer Correct Answer: D) Both (1) & (2). 22. ..... found that DNA was the reason that Griffith's bacterial strains transformed and killed the mice A) Watson and Crick. B) Hershey and Chase. C) Meselson and Stahl. D) Rosalind Franklin. Show Answer Correct Answer: B) Hershey and Chase. 23. Which of the following types of molecules help to hold the DNA strands apart while they are being replicated? A) Primase. B) Ligase. C) Single-stranded binding proteins. D) DNA polymerase. Show Answer Correct Answer: C) Single-stranded binding proteins. 24. We cannot predict the correct sequence of m-RNA from sequence of amino acid. It is due to which property of genetic code. A) Universality. B) Degeneracy. C) Unambiguoty. D) Non overlapping nature. Show Answer Correct Answer: B) Degeneracy. 25. The tRNA is coded by A) DNA sequence or gene. B) RNA sequence. C) Introns in the mature RNA. D) None of the above. Show Answer Correct Answer: A) DNA sequence or gene. ← 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