This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Biology > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 7 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Switching the position of promoter with terminator will cause all of the following variation, except the A) Change in nucleotide sequence of coding and template strands. B) Change in the polarity of coding and template strands. C) Change in the nucleotide sequence of transcribed RNA. D) Change in the sequence of amino acids in synthesized. Show Answer Correct Answer: B) Change in the polarity of coding and template strands. 2. Which mode of information transfer usually does not occur? A) DNA to DNA. B) DNA to RNA. C) DNA to protein. D) All occur in a working cell. Show Answer Correct Answer: C) DNA to protein. 3. The chain initiating codon is A) UUA. B) UAG. C) AUG. D) UAA. Show Answer Correct Answer: C) AUG. 4. Which of the following best represents the Central Dogma? A) RNA $\rightarrow$ DNA $\rightarrow$ proteins. B) DNA $\rightarrow$ proteins $\rightarrow$ RNA. C) DNA $\rightarrow$ RNA $\rightarrow$ proteins. D) Proteins $\rightarrow$ RNA $\rightarrow$ DNA. Show Answer Correct Answer: C) DNA $\rightarrow$ RNA $\rightarrow$ proteins. 5. In history of biology, HGP led to the development of ..... A) Biotechnology. B) Biosystematics. C) Bioinfomatics. D) Biomonitoring. Show Answer Correct Answer: C) Bioinfomatics. 6. Statement which is incorrect on Polyadenylation is A) Independent on the DNA template. B) 200-300 adenine chain is added as a tail. C) It occurs in the 3' end of the mRNA. D) None of the above. Show Answer Correct Answer: D) None of the above. 7. What is common between Purine and pyrimidine A) The positions. B) No of members. C) Nitrogen. D) Rings. Show Answer Correct Answer: C) Nitrogen. 8. Supercoiling in DNA is removed by A) Ligase. B) Gyrase. C) Polymerase. D) Helicase. Show Answer Correct Answer: B) Gyrase. 9. Which of the following investigators was (were) responsible for the discovery that in DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine? A) Oswald Avery, Maclyn McCarty, and Colin MacLeod. B) Erwin Chargaff. C) Matthew Meselson and Franklin Stahl. D) Alfred Hershey and Martha Chase. Show Answer Correct Answer: B) Erwin Chargaff. 10. RNA can also be converted into DNA A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. The molecules that function to replicate DNA in the cell are A) DNases. B) DNA polymerases. C) DNA nucleoside triphosphates. D) Nucleoside polymerases. Show Answer Correct Answer: B) DNA polymerases. 12. To initiate translation, the mRNA first binds to A) The smaller ribosomal sub-unit. B) The larger ribosomal sub-unit. C) The whole ribosome. D) No such specificity exists. Show Answer Correct Answer: A) The smaller ribosomal sub-unit. 13. How many base pairs present in core of nucleosome? A) 300. B) 200. C) 146. D) 156. Show Answer Correct Answer: C) 146. 14. What is the complementary DNA strand for 5'-ATGCATGC-3'? A) 3'-TACGTACG-5'. B) 5'-TACGTACG-3'. C) 5'-ATGCATGC-3'. D) 3'-ATGCATGC-5'. Show Answer Correct Answer: A) 3'-TACGTACG-5'. 15. A particular triplet of bases in the template strand of DNA is 5' AGT 3'. The corresponding codon for the mRNA transcribed is A) 3' ACU 5'. B) 3' UGA 5'. C) 3' UCA 5'. D) 5' TCA 3'. Show Answer Correct Answer: C) 3' UCA 5'. 16. Who performed classic experiments that supported the semiconservative model of DNA replication? A) Watson and Crick. B) Meselson and Stahl. C) Hershey and Chase. D) Jacob and MonodTagsDNA replication experimentsMeselson/Stahl experiment. Show Answer Correct Answer: B) Meselson and Stahl. 17. DNA duplex shows A) Left handed and parallel coiling. B) Left handed and antiparallel coiling. C) Right handed and parallel coiling. D) Right handed and antiparallel coiling. Show Answer Correct Answer: D) Right handed and antiparallel coiling. 18. Inverse transcription was discovered by:- A) Watson and Crick. B) Khorana. C) Temin an Baltimore. D) Meischer. Show Answer Correct Answer: C) Temin an Baltimore. 19. What is the primary function of DNA ligase in DNA replication? A) Unwinds the DNA helix. B) Synthesizes RNA primers. C) Proofreads newly synthesized DNA. D) Joins Okazaki fragments. Show Answer Correct Answer: B) Synthesizes RNA primers. 20. Semiconservative model A) Each new DNA molecule consists of one strand from the original molecule and one newly synthesized strand. B) Each new DNA molecule consists of one newly synthesized strand and one RNA strand. C) Each new DNA molecule consists of one strand from the original molecule and one strand from a different molecule. D) Each new DNA molecule consists of two newly synthesized strands. Show Answer Correct Answer: A) Each new DNA molecule consists of one strand from the original molecule and one newly synthesized strand. 21. How many base pairs present in linker DNA? A) 60. B) 58. C) 55. D) 54. Show Answer Correct Answer: D) 54. 22. In retro virus which type of DNA is found A) Single stranded haploid RNA. B) Single stranded diploid DNA. C) Single stranded triploid DNA. D) Double stranded RNA. Show Answer Correct Answer: B) Single stranded diploid DNA. 23. What is the main difference between DNA and RNA in terms of stability? A) DNA is less reactive than RNA. B) DNA is more stable than RNA. C) RNA is more stable than DNA. D) RNA is less reactive than DNA. Show Answer Correct Answer: C) RNA is more stable than DNA. 24. Which of the following features of genetic code allows bacteria to produce human insulin by recombinant DNA technology? A) Genetic code is not ambiguous. B) Genetic code is nearly universal. C) Genetic code is redundant. D) Genetic code is specific. Show Answer Correct Answer: B) Genetic code is nearly universal. 25. An mRNA ready for translation would have A) Introns, coding exons and non-coding exons. B) Coding exons and non-coding exons. C) Only coding exons. D) Only coding exons and introns. Show Answer Correct Answer: C) Only coding exons. 26. In a virus, the percentage of thymine was 21%, adenine 32%, cytosine 23% and guanine 24% in its genetic material. The nature of genetic material present in this virus is A) Ds DNA. B) Ss DNA. C) Ss RNA. D) Ds RNA. Show Answer Correct Answer: B) Ss DNA. 27. A DNA nucleotide contains all of the following, except ..... A) Deoxyribose. B) Phosphate group. C) CholesterolTagsDNA Structure. D) Nitrogenous base. Show Answer Correct Answer: C) CholesterolTagsDNA Structure. 28. Removal of RNA polymerase III from nucleoplasm will affect the synthesis of: A) T RNA. B) R RNA. C) M RNA. D) Hn RNA. Show Answer Correct Answer: A) T RNA. 29. Which one among the following was the first genetic material? A) Nuclein. B) RNA. C) DNA. D) Protein. Show Answer Correct Answer: B) RNA. 30. Which of the following can synthesize all types of RNA A) DNA. B) M-RNA. C) T-RNA. D) R-RNA. Show Answer Correct Answer: A) DNA. 31. Ead the following and select the correct statement/statements. (a) 23 s RNA act as a enzyme in prokaryotes. (b) In prokaryotes DNA is monocistronic (c) Francis Crick proposed the Central Dogma of Molecular biology. (d) In Eukaryotes three types of RNA polymerases are present. A) Only a. B) A nd b. C) A and c. D) A and d. Show Answer Correct Answer: D) A and d. 32. Synthesis of DNA from RNA template occurs in A) T$_{2}$. B) Reovirus. C) Rous sarcoma virus. D) TMV. Show Answer Correct Answer: C) Rous sarcoma virus. 33. In the process of transcription in Eukaryotes, the RNA polymerase I transcribes A) Precursor of mRNA, hnRNA. B) MRNA with additional processing, capping and tailing. C) TRNA, 5 srRNA and snRNAs. D) RRNAs-28 S, 18 S and 5.8 S. Show Answer Correct Answer: D) RRNAs-28 S, 18 S and 5.8 S. 34. According to HGP, genetic similarity between all human is A) 99.5%. B) 90%. C) 99.9%. D) 95%. Show Answer Correct Answer: C) 99.9%. 35. If DNA Polymerase is reading the following sequence:3'-AATCGC-5' what will the enzyme add to the growing DNA strand? A) 5'-TTAGCG-3'. B) 3'-AATCGC-5'. C) 5'-GCGATT-3'. D) 5'-AATCGC-3'. Show Answer Correct Answer: A) 5'-TTAGCG-3'. 36. GenomicDNAis ..... resultingintheproductionof ..... A) Transcribed, DNA. B) Translated, protein. C) Transcribed, mRNA. D) Replicated, mRNA. Show Answer Correct Answer: C) Transcribed, mRNA. 37. Which one of the following is the starter codon? A) UAG. B) AUG. C) UAA. D) UGA. Show Answer Correct Answer: B) AUG. 38. RNA that picks up specific amino acid from amino acid pool of cytoplasm to carry it to ribosome during protein synthesis is A) MRNA. B) GRNA. C) TRNA. D) RRNA. Show Answer Correct Answer: C) TRNA. 39. Which of the following is the function of the poly-A tail? A) To protect mRNA from hydrolytic enzymes. B) To allow for exit from nucleus. C) To signal for termination of translation. D) To decrease the length of mRNA molecules. Show Answer Correct Answer: A) To protect mRNA from hydrolytic enzymes. 40. Under which of the following conditions there will be no change in the reading frame of the following mRNA?5' AACAGCGGUGCUAUU 3' A) Insertion of G at 5th position. B) Deletion of G from 5th position. C) Insertion of A and G at 4th and 5th position respectively. D) Deletion of GGU from 7th 8th and 9th positions. Show Answer Correct Answer: D) Deletion of GGU from 7th 8th and 9th positions. 41. RNA polymerase II synthesizes mRNA in eukaryotes. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 42. DNA replication runs from ..... ' to ..... ' and is said to be ..... A) 5, 3, antiparallel. B) 3, 5, antiparallel. C) 5, 3, parallel. D) 3, 5, parallel. Show Answer Correct Answer: A) 5, 3, antiparallel. 43. The 3' end of a DNA strand is defined as the place where A) The phosphate group is not bound to another nucleotide. B) Both DNA strands end opposite each other. C) DNA polymerase binds to begin replication. D) There is a free-OH group at the 3' carbon of deoxyribose. Show Answer Correct Answer: D) There is a free-OH group at the 3' carbon of deoxyribose. 44. Which of the following is not required in translation A) AUG. B) Sigma factor. C) Ribosome. D) UTRs. Show Answer Correct Answer: B) Sigma factor. 45. Read the given statements and select the correct option.Statement I:Prokaryotes have single origin of replication in their genome.Statement II:QB bacteriophage has RNA as their genetic material. A) Only statement I is incorrect. B) Only statement II is incorrect. C) Both statement I and II are correct. D) Both statement I and II are incorrect. Show Answer Correct Answer: C) Both statement I and II are correct. 46. The most abundant RNA of cell is:- A) R-RNA. B) T-RNA. C) M-RNA. D) None of these. Show Answer Correct Answer: A) R-RNA. 47. What is the function of DNA ligase enzyme A) Responsible for polymerization activity. B) Help join the fragments of DNA. C) Converts a positive supercoil to a negative supercoil,. D) Helps in unwinding of DNA duplex. Show Answer Correct Answer: B) Help join the fragments of DNA. 48. First experimental proof for semi conservative DNA replication was shown in A) Rattus rattus. B) Streptococcus pneumoniae. C) Escherichia coli. D) Neurospora chrasa. Show Answer Correct Answer: C) Escherichia coli. 49. Bacteriophage nucleic acids were labelled by carrying out an infection of E. coli cells growing in A) $^{ 14}$C-labeled CO$_{2}$. B) $^{32}$P-labeled phosphate. C) $^{3}$H-labeled water. D) $^{35}$S-labeled sulfate. Show Answer Correct Answer: B) $^{32}$P-labeled phosphate. 50. What is the coding part of DNA A) Exon. B) Intron. C) All the above. D) None of the above. Show Answer Correct Answer: A) Exon. 51. Which of the following is odd in reference of genetic code? A) Glycine. B) Alanine. C) Tryptophan. D) Valine. Show Answer Correct Answer: C) Tryptophan. 52. Why both the strands of DNA are not transcribed? A) Both strands will code for RNA with different sequence. B) Code for two different proteins,. C) Complementary strands produced form a double stranded RNA. D) All of the above. Show Answer Correct Answer: D) All of the above. 53. What is the number of bases in an average gene A) 5000. B) 2000. C) 4000. D) 3000. Show Answer Correct Answer: D) 3000. 54. In Meselson and Stahl's experiment, ..... generation(s) after cells were transferred from heavy-nitrogen medium to light nitrogen medium, all of the DNA was of hybrid density. A) 2nd generation. B) 4th generation. C) I generation. D) 3rd generation. Show Answer Correct Answer: C) I generation. 55. The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ..... direction. A) Only 5' $\rightarrow$ 3'. B) Only 3' $\rightarrow$ 5'. C) Both (a) and (b). D) None of these. Show Answer Correct Answer: A) Only 5' $\rightarrow$ 3'. 56. Percentage of (G + C) is A) $\frac{\left(G+C\right)\\times\left(A+T\right)}{100}$. B) $\frac{G+C}{\left(A+G+T+C\right)}$. C) $\frac{G+C}{\left(A+G+T+C\right)}\times100$. D) $\frac{100}{\left(A+T\right)}\times G+C$. Show Answer Correct Answer: C) $\frac{G+C}{\left(A+G+T+C\right)}\times100$. 57. Which scientist(s) determined that DNA replication was a semi-conservative process? A) Hershey & Chase. B) Griffith. C) Meselson & Stahl. D) Chargaff. Show Answer Correct Answer: C) Meselson & Stahl. 58. Which scientists determined that DNA was a double helix? A) Meselson & Stahl. B) Hershey & Chase. C) Watson & Crick. D) Franklin & Watkins. Show Answer Correct Answer: C) Watson & Crick. 59. Mark the one, which is NOT the transcription inhibitor in eukaryotes. A) Rho factor. B) Actinomycin D. C) Acridine dye. D) Rifampicin. Show Answer Correct Answer: A) Rho factor. 60. In eukaryotic gene expression, the process of adding a methyl guanosine cap occurs during: A) Translation. B) Transcription initiation. C) RNA processing. D) DNA replication. Show Answer Correct Answer: C) RNA processing. ← PreviousNext →Related QuizzesScience QuizzesClass 12 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 8Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books