This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 36 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 36 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. To initiate translation, the wiRNA first bind 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. 2. The process of transfer of genetic information from DNA to RNA/ formation of RNA from DNA is A) Transversion. B) Transcription. C) Translation. D) Translocation. Show Answer Correct Answer: B) Transcription. 3. DNA contains the template needed to copy itself, but it has no catalytic activity in cells. What catalyzes the formation of phosphodiester bonds between adjacent nucleotides in the DNA polymer being formed during DNA replication? A) DNA polymerase. B) RNA primers. C) ATP. D) Ribozymes. Show Answer Correct Answer: A) DNA polymerase. 4. Select the correct term to complete:DNA in eukaryotes is wrapped around ..... proteins. A) Histones. B) Kinesins. C) Actins. D) Tubulins. Show Answer Correct Answer: A) Histones. 5. UAA, UAG, UGA are known as nonsense codons. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 6. Regulatory proteins are the accessory proteins that interact with RNA polymerase and affect its role in transcription. Which of the following statements is correct about regulatory protein? A) They only increase expression. B) They only decrease expression. C) They interact with RNA polymerase but do not affect the expression. D) They can act both as activators and as repressors. Show Answer Correct Answer: D) They can act both as activators and as repressors. 7. The enzyme that restores the phosphodiester linkage between adjacent fragments in the lagging strand during DNA replication is A) DNA ligase. B) Primase. C) Reverse transcriptase. D) Helicase. Show Answer Correct Answer: A) DNA ligase. 8. In Hershey and Chase experiment, the protein of T2 phage was made radioactive by using A) S$^{32}$. B) P$^{31}$. C) S$^{35}$. D) P$^{32}$. Show Answer Correct Answer: C) S$^{35}$. 9. Initiation of DNA strand synthesis is performed by: A) DNA polymerase I. B) DNA Helicase. C) DNA Primase. D) DNA Topoisomerase. Show Answer Correct Answer: C) DNA Primase. 10. R strain of the bacteria was non virulent due to lack of lipopolysaccharide coat A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. Which of the following does not take part in stabilizing the cloverleaf model of the tRNA? A) Hydrogen bond. B) Ionic bond. C) Base and sugar-phosphate backbone interaction. D) Base stacking. Show Answer Correct Answer: B) Ionic bond. 12. Which one of the following is not applicable to RNA? A) Heterocyclic nitrogenous bases. B) Chargaff's rule. C) Complementary base pairing. D) 5' phosphoryl and 3' hydroxyl ends. Show Answer Correct Answer: B) Chargaff's rule. 13. A deoxyribose nucleoside is a A) Deoxyribose plus a nitrogenous base. B) Sugar and a phosphate. C) Deoxyribose plus a nitrogenous base and a phosphate. D) Ribose plus a nitrogenous base. Show Answer Correct Answer: A) Deoxyribose plus a nitrogenous base. 14. If the percentage of DNA is made of 30% Thymine, what is the correct percentage of Guanine? A) 30. B) 15. C) 20. D) 60. Show Answer Correct Answer: C) 20. 15. Which process separates DNA fragments by size? A) DNA sequencing. B) Gel electrophoresis. C) Polymerase chain reaction. D) Recombinant DNA technology. Show Answer Correct Answer: B) Gel electrophoresis. 16. Which of the following best describes the key function of helicases during transcription? A) Cleaving methyl groups from an unwound DNA strand. B) Catalyzing the interaction between transcription factors and the DNA strand. C) Separation of two strands of DNA; "unwinding" gives polymerases access to the strand. D) Relief of tension in the DNA strands to prevent breakage. Show Answer Correct Answer: C) Separation of two strands of DNA; "unwinding" gives polymerases access to the strand. 17. The process of going from DNA to mRNA is called A) Transcription. B) Translation. C) Transportation. D) Transient. Show Answer Correct Answer: A) Transcription. 18. Which component of a nucleosome forms the core? A) H3-H4 tetramer + H2A-H2B dimer. B) Only H1. C) Only H2. D) H2A-H2B tetramer. Show Answer Correct Answer: A) H3-H4 tetramer + H2A-H2B dimer. 19. Taylor conducted the experiment to prove semiconservative mode of chromosome replication on: A) Drosophila melanogaster. B) E. coli. C) Vinca rosea. D) Vicia faba. Show Answer Correct Answer: D) Vicia faba. 20. Mention the anticodon sequence of bases for AUG A) TAC. B) UAC. C) All the above. D) None of the above. Show Answer Correct Answer: B) UAC. 21. Which one of the following group of codons is called as degenerate codons? A) UAA, UAG and UGA. B) GUA, GUG, GCA, GCG and GAA. C) UUC, UUG, CCU, CAA and CUG. D) UUA, UUG, CUU, CUC and CUG. Show Answer Correct Answer: A) UAA, UAG and UGA. 22. Which was the last human chromosome to be completely sequenced: A) Chromosome 1. B) Chromosome 11. C) Chromosome 21. D) Chromosome x. Show Answer Correct Answer: A) Chromosome 1. 23. According to HGP, human genome consists of approximately A) 1 lac genes. B) 50 thousand genes. C) 30 thousand genes. D) 20 thousand genes. Show Answer Correct Answer: C) 30 thousand genes. 24. If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is:5'-ATGAATG-3', the sequence of bases in its RNA transcript would be: A) 5'-CAUUCAU-3'. B) 5'-GUAAGUA-3'. C) 5'-UACUU AC-3'. D) 5'-AUG A AUG-3'. Show Answer Correct Answer: B) 5'-GUAAGUA-3'. 25. What is central dogma A) Formation of RNA from DNA and formation of proteins from RNA. B) Formation of protein from DNA and formation of RNA from protein. C) Formation of DNA from RNA and formation of protein from DNA. D) None of the above. Show Answer Correct Answer: A) Formation of RNA from DNA and formation of proteins from RNA. ← 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