This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 27 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 27 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The anticodon of tRNA is complementary to: A) The template strand of DNA. B) The coding strand of DNA. C) The codon on mRNA. D) Another tRNA molecule. Show Answer Correct Answer: C) The codon on mRNA. 2. Which statement best describes the antiparallel nature of the DNA double helix proposed by Watson and Crick? A) Both strands run 5'$\rightarrow$3'. B) One strand runs 5'$\rightarrow$3' and the other 3'$\rightarrow$5'. C) Both strands run 3'$\rightarrow$5'. D) Strands have no directionality. Show Answer Correct Answer: B) One strand runs 5'$\rightarrow$3' and the other 3'$\rightarrow$5'. 3. What was most remarkable about the Griffith's experiment? A) Griffith obtained his results despite the fact that he failed his medical board exam. B) DNA, not protein, was found to be the genetic molecule. C) Something from a dead organism could change living cells. D) Viruses, which were nonliving, could change living cells. Show Answer Correct Answer: C) Something from a dead organism could change living cells. 4. In Meselson and Stahl experiment, 20 min after shifting E. coli from N15 to N14 medium, the bacterial cells will have A) Heavy DNA. B) Hybrid DNA. C) Light DNA. D) Hybrid and light DNA in 1:1. Show Answer Correct Answer: B) Hybrid DNA. 5. During transcription, if the nucleotide sequence ofthe DNA strand that is being coded is ATACG, thenthe nucleotide sequence in the mRNA would be A) TATGC. B) TCTGG. C) UAUGC. D) UATGC. Show Answer Correct Answer: C) UAUGC. 6. W.r.t the organization of eukaryotic chromosome choose the correct sequence of steps A) DNA $\rightarrow$ Solenoid$\rightarrow$ Nucleosome. B) Nucleosome $\rightarrow$ Solenoid $\rightarrow$ Nuclear scaffold proteins. C) Chromatin $\rightarrow$ Solenoid $\rightarrow$ Nucleosome. D) Solenoid $\rightarrow$ Nucleosome $\rightarrow$ Chromatid. Show Answer Correct Answer: B) Nucleosome $\rightarrow$ Solenoid $\rightarrow$ Nuclear scaffold proteins. 7. As the number of base pairs in prokaryotes is 4.6 x 10$^{6}$bp and if it takes 38min to replication then what is the polymerisation rate A) 2000 bp/s. B) 1000bp/s. C) 3000bp/s. D) 4000 bp/s. Show Answer Correct Answer: A) 2000 bp/s. 8. Which one of the following triplet codes, is correctly matched with its specificity for an aminoacid in protein synthesis or as 'starts or ' stops codon? A) UAC Tyrocine. B) UCG Start. C) UUU Stop. D) UGU Leucine. Show Answer Correct Answer: A) UAC Tyrocine. 9. The pathogenic nature is provided by the following part of pneumococcus A) Nucleoprotein. B) Protein coat. C) Cell wall. D) Carbohydrate capsule. Show Answer Correct Answer: D) Carbohydrate capsule. 10. Select the correct box to complete:The promoter region in prokaryotes contains the ..... box. A) -10 (Pribnow). B) -35. C) TATA. D) Kozak. Show Answer Correct Answer: A) -10 (Pribnow). 11. Which enzyme is responsible for the transcribing the precursor of mRNA in eukaryotes? A) RNA polymerase I. B) RNA polymerase II. C) RNA polymerase III. D) DNA polymerase. Show Answer Correct Answer: B) RNA polymerase II. 12. Discontinuous synthesis of DNA occurs in one strand, because: A) DNA molecule being synthesised is very long. B) DNA dependent DNA polymearse catalyses polymerisation only in one direction (5' $\rightarrow$ 3'). C) It is a more efficient process. D) DNA ligase has to have a role. Show Answer Correct Answer: B) DNA dependent DNA polymearse catalyses polymerisation only in one direction (5' $\rightarrow$ 3'). 13. Which of the following is not true of RNA processing? A) Ribozymes(enzymes that work only on RNA) may function in RNA splicing. B) Exons are cut out before mRNA leaves the nucleus. C) RNA splicing can be catalyzed by spliceosomes. D) Nucleotides may be added at both ends of the RNA. Show Answer Correct Answer: B) Exons are cut out before mRNA leaves the nucleus. 14. Chargaff's rules of base pairing state that A) The ratio of purines to pyrimidines is roughly equal in all tested organisms. B) The ratio of A to T is roughly equal in all tested organisms. C) The ratio of A + T and G + C is roughly equal in all tested organisms. D) A and b. Show Answer Correct Answer: D) A and b. 15. Which of the following combination is a correct observation for the transformation experiment performed by Griffith? A) Type IIIS (heat killed) + type IIR (living) + mouse = living. B) Type IIR (living) + mouse = dead. C) Type IIIS (heat killed) + mouse = dead. D) Type IIIS (living) + mouse = dead. Show Answer Correct Answer: D) Type IIIS (living) + mouse = dead. 16. What is the nature of the strands of the DNA duplex? A) Anti parallel and complementary. B) Identical and complementary. C) Anti-parallel and non-complementary. D) Dissimilar and non-complementary. Show Answer Correct Answer: A) Anti parallel and complementary. 17. What is the fully processed hnRNA which moves out of the nucleus is called A) MRNA. B) RRNA. C) TRNA. D) SnRNA. Show Answer Correct Answer: A) MRNA. 18. The sugar lactose induces synthesis of the enzyme lactase. What happens when an E.coli (bacterial) cell runs out of lactose? A) Repressor protein binds to the operator. B) Repressor protein binds to the promoter. C) RNA polymerase attaches to the promoter. D) RNA polymerase attaches to the repressor. Show Answer Correct Answer: A) Repressor protein binds to the operator. 19. Correct order of molecular weight is:- A) DNA < r-RNA < t-RNA. B) DNA < m-RNA < r-RNA. C) T-RNA < m-RNA < DNA. D) T-RNA < DNA < m-RNA. Show Answer Correct Answer: C) T-RNA < m-RNA < DNA. 20. What enzyme joins Okazaki fragments? A) DNA ligase. B) Topoisomerase. C) Helicase. D) Primase. Show Answer Correct Answer: A) DNA ligase. 21. In Hershey and chase experiments, radioactive 32P was used to culture bacteriophages which resulted in radioactive A) Viral DNA. B) Viral proteins capsule of bacteriophage. C) Viral Head and Tail part. D) None of these. Show Answer Correct Answer: A) Viral DNA. 22. Which of the following is not the characteristic feature of genetic code A) Triplet nature. B) Mostly universal. C) Ambiguous. D) Degeneracy. Show Answer Correct Answer: C) Ambiguous. 23. Regulation of gene expression occurs at the level of A) Transcription. B) Processing/splicing. C) Translation. D) All of these. Show Answer Correct Answer: D) All of these. 24. Which of the following describes the conversion factor between nucleic acids and proteins? A) 3 amino acids = 1 nucleotide. B) 3 amino acids = 3 nucleotides. C) 3 nucleotides = 1 amino acid. D) 3 nucleotides = 3 amino acids. Show Answer Correct Answer: C) 3 nucleotides = 1 amino acid. 25. Replication Fork A) A protein used during DNA replication. B) A Y-shaped region where DNA replication ends. C) A Y-shaped region where the parental strands of DNA are being unwound. D) Y-shaped enzymes used to separate DNA. Show Answer Correct Answer: C) A Y-shaped region where the parental strands of DNA are being unwound. ← 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