This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 5 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The information in DNA is contained in ..... A) The types of sugars used in making the DNA molecule. B) The sequence of amino acids that makes up the DNA molecule. C) The sequence of nucleotides along the length of the two strands of the DNA molecule. D) The variation in the structure of nucleotides that make up the DNA molecule. Show Answer Correct Answer: C) The sequence of nucleotides along the length of the two strands of the DNA molecule. 2. Bacillus thuringiensis is used as biocontrol agent against A) Mosquitoes. B) Aphids. C) Pathogenic fungi. D) Butterfly caterpillars. Show Answer Correct Answer: D) Butterfly caterpillars. 3. Name the enzyme which is important for DNA template to catalyze the polymerization of deoxynucleotides? A) DNA dependent RNA polymerase. B) DNA dependent DNA polymerase. C) RNA dependent RNA polymerase. D) None of the above. Show Answer Correct Answer: B) DNA dependent DNA polymerase. 4. E.coli divides in every A) 20 mins. B) 30 mins. C) 40 mins. D) 60 mins. Show Answer Correct Answer: A) 20 mins. 5. Which of the following is the site for attachment of amino acid in tRNA molecule? A) 5' end. B) 3' end. C) Anti-codon loop. D) None of the above. Show Answer Correct Answer: C) Anti-codon loop. 6. What is the function of primer A) To help DNA polymerase for initiation. B) To help RNA polymerase for initiation. C) To help DNA polymerase for termination. D) To help RNA polymerase for termination. Show Answer Correct Answer: B) To help RNA polymerase for initiation. 7. Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DNA? A) Rosalind Franklin. B) Maurice Wilkins. C) Erwin Chargaff. D) Meselson and Stahl. Show Answer Correct Answer: B) Maurice Wilkins. 8. Wrapping of negatively charged DNA around positively charged histone octamer is called A) Nucleosome. B) Chromatin. C) Chromosome. D) Histone. Show Answer Correct Answer: A) Nucleosome. 9. One strand of DNA (non template) has base sequence CAG TCG GAT. What will be the sequence of bases in mRNA? A) AGC CTA CTA. B) GTC AGC CTC. C) CAG UCG GAU. D) GAC TAG CTA. Show Answer Correct Answer: C) CAG UCG GAU. 10. Who coined the term nuclein? A) Friedrich Meischer. B) Crick. C) Watson. D) Franklin. Show Answer Correct Answer: A) Friedrich Meischer. 11. During replication of DNA okazaki fragments are formed in the direction of ..... A) 3'$\rightarrow$5'. B) 5'$\rightarrow$3'. C) 5'$\rightarrow$5'. D) 3'$\rightarrow$3'. Show Answer Correct Answer: B) 5'$\rightarrow$3'. 12. Which base forms two hydrogen bonds with adenine? A) Cytosine. B) Thymine. C) Guanine. D) Adenine itself. Show Answer Correct Answer: B) Thymine. 13. In *E. coli*, what is the function of DNA polymerase III? A) To unwind the DNA helix during replication. B) To add nucleotides to the 3' end of a growing DNA strand. C) To degrade damaged DNA molecules. D) To seal together the broken ends of DNA strands. Show Answer Correct Answer: B) To add nucleotides to the 3' end of a growing DNA strand. 14. Semiconservative DNA replication was proved by Messelson and Stahl, in which DNA was made A) Radioactive using N$^{15}$. B) Heavy using $^{14}$NH$_{4}$Cl. C) Heavy using $^{15}$NH$_{4}$Cl. D) Radioactive using $^{14}$NH$_{4}$Cl. Show Answer Correct Answer: C) Heavy using $^{15}$NH$_{4}$Cl. 15. Which of the following statements is incorrect regarding the Hershey and Chase experiment? A) They worked with viruses that infect bacteria called bacteriophage. B) Viruses grown in the presence of radioactive 32P contain radioactive DNA. C) The viral coats were removed from the bacteria by agitating in a blender. D) Bacteria that were infected with bacteriophage that had radioactive proteins showed radioactive signals after centrifugation. Show Answer Correct Answer: D) Bacteria that were infected with bacteriophage that had radioactive proteins showed radioactive signals after centrifugation. 16. Which of the following ensures the stability of the helical structure of a DNA? A) Presence of repetitive structures of a DNA code. B) Stacking of one base pair over the other. C) Presence of aneuploidy. D) Occurrence of chromosomal rearrangements. Show Answer Correct Answer: B) Stacking of one base pair over the other. 17. Adenine pairs with guanine. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 18. If there was a mutation in the gene that coded for RNA primase, then what would most likely happen? A) RNA bases would start to be found in the DNA. B) DNA wouldn't unwind. C) The lagging strand would elongate, but the leading strand wouldn't. D) DNA polymerase would be unable to initiate replication. Show Answer Correct Answer: D) DNA polymerase would be unable to initiate replication. 19. Which of the following types of bacteria were used in Griffith's transformation experiment? A) Diplococcus, R-III and S-II type. B) Pneumococcus, T$_{2}$ phage. C) Streptococcus, R-II and S-III type. D) Diplococcus, E. coli. Show Answer Correct Answer: C) Streptococcus, R-II and S-III type. 20. HnRNA converts to mRNA by A) Splicing. B) Translation. C) Replication. D) Crossing over. Show Answer Correct Answer: A) Splicing. 21. Altering patterns of gene expression in prokaryotes would most likely serve the organism's survival in which of the following ways? A) Allowing young organisms to respond differently from more mature organisms. B) Organizing gene expression so that genes are expressed in a given order. C) Allowing the organism to adjust to changes in environmental conditions. D) Allowing each gene to be expressed an equal number of times. Show Answer Correct Answer: C) Allowing the organism to adjust to changes in environmental conditions. 22. Triplet UUU codes for A) Leucine. B) Methionine. C) Phenylalanine. D) Glycine. Show Answer Correct Answer: C) Phenylalanine. 23. Where does the DNA get energy for polymerization? A) Deoxynucleotide triphosphates. B) Polymerase. C) Hydrogen bond breaking. D) By breakdown of phosphodiester bonds. Show Answer Correct Answer: A) Deoxynucleotide triphosphates. 24. Which of the following sugars is found in RNA? A) Hexose. B) Fructose. C) Ribose. D) Glucose. Show Answer Correct Answer: C) Ribose. 25. The human chromosome with the highest and least number of genes in them are respectively: A) Chromosome 21 and Y. B) Chromosome 1 and X. C) Chromosome 1 and Y. D) Chromosome X and Y. Show Answer Correct Answer: C) Chromosome 1 and Y. ← 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 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 10Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books