This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 37 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 37 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The proof for semiconservative nature of DNA replication was given by A) Watson and Crick. B) Hershey and Chase. C) Meselson and Stahl. D) Avery, MacLeod and McCarty. Show Answer Correct Answer: C) Meselson and Stahl. 2. Which of the following statements about replication origins is/are correct? A) The two strands of DNA at the origin of replication are separated, creating a replication bubble. B) The DNA sequence at the origin of replication is recognized by specific proteins that bind to the origin. C) Replication proceeds in both directions from each origin. D) All of the listed responses are correct. Show Answer Correct Answer: D) All of the listed responses are correct. 3. Semi-conservative method of DNA replication was first demonstrated in A) E.coli. B) D.melanogaster. C) Bacteriophage. D) S. pneumonae. Show Answer Correct Answer: A) E.coli. 4. The supporting evidence for the semi conservative replication of DNA are A) E. Coli culturing in $^{15}$N medium. B) Radioactive thymidine usage in Vicia faba plant's DNA replication. C) Both (a) and (b). D) Protein syntehsis. Show Answer Correct Answer: C) Both (a) and (b). 5. During transcription, the DNA site at which RNA polymerase binds is called A) Enhancer. B) Promoter. C) Regulator. D) Receptor. Show Answer Correct Answer: B) Promoter. 6. What are the coding sequences in eukaryotes known as? A) Introns. B) Exons. C) Promoters. D) Terminals. Show Answer Correct Answer: B) Exons. 7. In bacteriophage experiment, performed by Hershey and Chase, radioactivity in supernatant was due to A) P32 in capsid of T2 bacteriophage. B) S35 in DNA of T2 bacteriophage. C) S35 in capsid of T2 bacteriophage. D) P32 in DNA of T2 bacteriophage. Show Answer Correct Answer: C) S35 in capsid of T2 bacteriophage. 8. The DNA of telomeres has been found to be highly conserved throughout the evolution of eukaryotes. What does this most probably reflect? A) That the critical function of telomeres must be maintained. B) That mutations in telomeres are relatively advantageous. C) That new evolution of telomeres continues. D) The low frequency of mutations occurring in this DNA. Show Answer Correct Answer: A) That the critical function of telomeres must be maintained. 9. If the sequence of bases in DNA is GCTTAGGCAA then the sequence of bases in its transcript will be A) GCTTAGGCAA. B) CGAATCCGTT. C) CGAAUCCGUU. D) AACGGAUUCG. Show Answer Correct Answer: C) CGAAUCCGUU. 10. With regard to mature mRNA in eukaryotes: A) Exons and introns do not appear in the mature RNA. B) Exons appear but introns do not appear in the mature RNA. C) Introns appear but exons do not appear in the mature RNA. D) Both exons and introns appear in the mature RNA. Show Answer Correct Answer: B) Exons appear but introns do not appear in the mature RNA. 11. Name the enzyme that facilitates opening of DNA helix during transcription. A) DNA helicase. B) DNA polymerase. C) RNA polymerase. D) DNA ligase. Show Answer Correct Answer: C) RNA polymerase. 12. Portion of gene which is transcribed but nottranslated is:- A) Exon. B) Intron. C) Cistron. D) Codon. Show Answer Correct Answer: B) Intron. 13. Single-strand binding protein A) Breaks apart the DNA molecules. B) Bind to the unpaired DNA strands, keeping them from repairing. C) Untwist the DNA molecule. D) Bind to the paired DNA strands, keeping them from repairing. Show Answer Correct Answer: B) Bind to the unpaired DNA strands, keeping them from repairing. 14. The two antiparallel strands of nucleotides that form the DNA double helix are held together by ..... A) Covalent bonds between carbon atoms in deoxyribose molecules. B) Hydrogen bonds between nucleotide bases. C) 5' deoxyribose and phosphate bonds. D) Ionic bonds between guanine and cytosine. Show Answer Correct Answer: B) Hydrogen bonds between nucleotide bases. 15. Choose the correct option w.r.t. RNA. A) Presence of thymine in place of uracil. B) Absence of free 2' OH in sugar. C) Mutates at faster rate. D) Is non-catalytic. Show Answer Correct Answer: C) Mutates at faster rate. 16. In the nuclein obtaining experiment, if scientist used RBC instead of WBC, whether he would discovered it? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: B) No. 17. What are the gaps between the newly synthesized DNA on the lagging strand called? A) Okazaki fragments. B) Polymer gaps. C) Helicase fragments. D) Acidic gapsTagsDNA replication terms. Show Answer Correct Answer: A) Okazaki fragments. 18. ABCDEFGH. If it is changed to ACGH, this is acase of A) Frame-shift mutations. B) Deletions. C) Inversions. D) Duplication. Show Answer Correct Answer: B) Deletions. 19. The important enzyme required for the process of transcrption from DNA to mRNA is ..... A) DNA ligase. B) DNA polymerase. C) RNA polymerase. D) DNA helicase. Show Answer Correct Answer: C) RNA polymerase. 20. Why are DNA dependent DNA polymerase enzymes very efficient? A) They catalyze polymerization very fast. B) They can catalyse with high degree of accuracy. C) The catalyse the reactions only in 5'-3' direction. D) All of the above. Show Answer Correct Answer: D) All of the above. 21. What is the main enzyme involved in DNA replication? A) Helicase. B) RNA polymerase. C) DNA-dependent DNA polymerase. D) DNA ligase. Show Answer Correct Answer: C) DNA-dependent DNA polymerase. 22. The process of transfer of genetic information from DNA to RNA formation or RNA from DNA is A) Transversion. B) Transcription. C) Translation. D) Translocation. Show Answer Correct Answer: B) Transcription. 23. When adding the next monomer to a growing DNA strand, the monomer is added to the A) 1' carbon of the deoxyribose. B) 2' carbon of the deoxyribose. C) 3' carbon of the deoxyribose. D) 4' carbon of the deoxyribose. Show Answer Correct Answer: C) 3' carbon of the deoxyribose. 24. Column I Column II A) Watson and Crick P) DNA fingerprinting B) R. W. Holley Q) Decipher genetic code C) Marshal Nirenberg R) Double helix of DNA D) Jacob and Monod S) Clover model of tRNA E) Alec Jeffrey T) Lac operon concept A) R S P T Q. B) R S Q T P. C) R Q P T S. D) R T S P Q. Show Answer Correct Answer: B) R S Q T P. 25. If a completely radioactively labelled DNA molecule undergoes 2 rounds of replicationona anon radioactive medium, then what will be the radioactive status of the four resulting molecules? A) Half of the members contain no radioactivity. B) All four contain radioactivity. C) Three out of 4 contain radioactivity. D) None will be radioactive. Show Answer Correct Answer: A) Half of the members contain no radioactivity. ← 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