This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 39 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 39 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which is also called the sense strand? A) Template strand. B) Coding strand. C) 3'-5'. D) None of the above. Show Answer Correct Answer: A) Template strand. 2. The enzyme that unwinds the DNA to prepare for replication A) Helicase. B) Replicase. C) Polymerase. D) SynthaseTagsDNA replication enzymes. Show Answer Correct Answer: A) Helicase. 3. If a double-stranded DNA molecule contains 30% T, how much G does it contain? A) 20%. B) 30%. C) 40%. D) 50%. Show Answer Correct Answer: A) 20%. 4. Frederick Griffith's transforming principle demonstrated that: A) Proteins are the genetic material. B) A heat-stable agent from virulent bacteria can genetically alter nonvirulent bacteria. C) RNA is the hereditary molecule. D) Mutations cannot be inherited. Show Answer Correct Answer: B) A heat-stable agent from virulent bacteria can genetically alter nonvirulent bacteria. 5. The structure in chromatin seen as 'beads-on-string' when viewed under an electron microscope is called: A) Nucleosomes. B) Nucleotides. C) Nucleosides. D) Histone octamer. Show Answer Correct Answer: A) Nucleosomes. 6. Ligase is an enzyme required for A) Proofreading. B) Joining DNA bits. C) Breaking of DNA. D) Renaturation of DNA. Show Answer Correct Answer: B) Joining DNA bits. 7. DNA is a polymer made of ..... A) Sugars. B) Amino acids. C) Fats. D) Nucleotides. Show Answer Correct Answer: D) Nucleotides. 8. Harshey and Chase provided the final proof that DNA is the genetic material A) True. B) Flase. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 9. During transcription, the site of the DNA molecule at which RNA polymerase binds is called: A) Receptor. B) Promoter. C) Enhancer. D) Regulator. Show Answer Correct Answer: B) Promoter. 10. Nucleosome contains A) Only histone protein. B) Both DNA and histone protein. C) Only DNA. D) Both DNA and RNA. Show Answer Correct Answer: B) Both DNA and histone protein. 11. The technique developed by Frederick Sanger was crucial for: A) DNA fingerprinting. B) DNA sequencing. C) Gene cloning. D) Protein synthesis. Show Answer Correct Answer: B) DNA sequencing. 12. If a double stranded DNA has 20% of cytosine, Calcualte the percentage of adenine in DNA. A) 30 percentage. B) 40percentage. C) 50 percentage. D) 60 percentage. Show Answer Correct Answer: A) 30 percentage. 13. In the Meselson/Stahl experiment, which of the following results was observed in the CsCl2 density sedimentation separation of the DNA replication products after ONE generation in $^{14}$NH4Cl A) A single band of intermediate density. B) Two bands, one of high density and one of low density. C) Two bands, one of high density and one of intermediate density. D) Two bands, one of low density and one of intermediate density. Show Answer Correct Answer: D) Two bands, one of low density and one of intermediate density. 14. Name the person who discovered 'nuclein' A) Fredrick Miecher. B) Watson. C) Crick. D) Basel. Show Answer Correct Answer: A) Fredrick Miecher. 15. In the lac operon, the repressor protein is coded by: A) Z gene. B) Y gene. C) A gene. D) I gene. Show Answer Correct Answer: D) I gene. 16. A complex of ribosomes attached to a single strand of RNA is known as A) Polysome. B) Polymer. C) Polypeptide. D) Okazaki fragment. Show Answer Correct Answer: A) Polysome. 17. Satellite DNA A) Is classified in many categories such as micro satellites, minisatelites, etc. On the basis of base composition length of segments and number of repetitive units. B) Normally does not code for any proteins. C) Show polymorphism. D) Forms the basis of DNA Finger printing. Show Answer Correct Answer: B) Normally does not code for any proteins. 18. Telomere shortening puts a limit on the number of times a cell can divide. Research has shown that telomerase can extend the life span of cultured human cells. How might adding telomerase affect cellular aging? A) Telomerase shortens telomeres, which delays cellular aging. B) Telomerase would have no effect on cellular aging. C) Telomerase eliminates telomere shortening and slows aging. D) Telomerase will speed up the rate of cell proliferation. Show Answer Correct Answer: C) Telomerase eliminates telomere shortening and slows aging. 19. It is nonsense to think that DNA has- A) 4 types of nitrogenous base. B) 2 types of nitrogenous base. C) 3 types of nitrogenous base. D) 6 types of nitrogenous base. Show Answer Correct Answer: C) 3 types of nitrogenous base. 20. Chargraff's Rule says that A) Adenine will be equal to Thymine. B) Cytosine will be equal to Thymine. C) Uracil will be equal to Guanine. D) Adenine will be equal to Cytosine. Show Answer Correct Answer: A) Adenine will be equal to Thymine. 21. Which one of the following is not found in DNA? A) Carbon. B) Oxygen. C) Nitrogen or Hydrogen. D) Sulfur. Show Answer Correct Answer: D) Sulfur. 22. Who gave the X ray data for double helical model of DNA A) Francis Crick. B) James Watson. C) Rosalind Franklin. D) Maurice Wilkins. Show Answer Correct Answer: C) Rosalind Franklin. 23. In DNA replication, the primer is:- A) A small deoxyribonucleotide polymer. B) A small ribonucleotide polymer. C) Helix destabilizing protein. D) Enzyme taking part in joining nucleotides ofnew strand. Show Answer Correct Answer: B) A small ribonucleotide polymer. 24. Which of the following is a nonsense codon? A) UAG. B) AUG. C) GUG. D) CUG. Show Answer Correct Answer: A) UAG. 25. DNA has a alternate grooves- A) One major and one minor. B) Two major and one minor. C) One major and two minor. D) Two major and two minor. Show Answer Correct Answer: C) One major and two minor. ← 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