This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 29 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 29 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The bioactive substance which removes clots from blood vessels is A) Butyric acid. B) Cyclosporin A. C) Statins. D) Streptokinase. Show Answer Correct Answer: D) Streptokinase. 2. In DNA you find which type(s) of bond******A. Phosphodiester******B. Phosphoester******C. Hydrogen******D. Glycosidic bond A) C, D. B) A, B, C, D. C) B, C, D. D) A, B, C. Show Answer Correct Answer: B) A, B, C, D. 3. In 1957, Meselson and Stahl concluded from their studies that A) DNA replicates conservatively. B) DNA replicates semiconservatively. C) DNA replicates dispersively. D) DNA does not replicate. Show Answer Correct Answer: B) DNA replicates semiconservatively. 4. Which of the following is required as inducer for the expression of lac operon? A) Lactose. B) Galactose and Lactose. C) Glucose. D) Galactose. Show Answer Correct Answer: A) Lactose. 5. Genetic information is passed onto the next generation through: A) DNA replication. B) Protein synthesis. C) All the above. D) None of the above. Show Answer Correct Answer: A) DNA replication. 6. To make protein with 178 amino acid from eukaryotic gene having 1350 bp, the length of initial and processed mRNA transcript would respectively be A) 640 b, 52 b. B) 1350 b, 1350 b. C) 1350 b, 537 b. D) 670 b, 540 b. Show Answer Correct Answer: C) 1350 b, 537 b. 7. Purines found both in DNA and RNA are A) Guanine and cytosine. B) Cytosine and thymine. C) Adenine and guanine. D) Adenine and thymine. Show Answer Correct Answer: C) Adenine and guanine. 8. The enzyme involved in amino acid activation is A) ATP synthase. B) Aminoacyl tRNA synthetase. C) Aminoacyl mRNA synthetase. D) Aminoacyl rRNA synthetase. Show Answer Correct Answer: B) Aminoacyl tRNA synthetase. 9. Which of the following molecules functions to transfer information from one generation to the next? A) DNA. B) MRNA. C) TRNA. D) Proteins. Show Answer Correct Answer: A) DNA. 10. In biochemical explanation of transformation, process of transformation of R-strain of Streptococcus did not get affected by all the following enzymes, except A) Protease. B) RNase. C) DNase. D) Lipase. Show Answer Correct Answer: C) DNase. 11. What role does the enzyme DNA ligase play during DNA replication A) Joins nucleotides. B) Cleaves nucleotides. C) Opens the helix. D) Maintains the helix. Show Answer Correct Answer: A) Joins nucleotides. 12. How far is each base pair from the next one in DNA double helix model? A) 2 nm. B) 3.4nm. C) 34 nm. D) 0.34 nm. Show Answer Correct Answer: D) 0.34 nm. 13. Nitrogenous bases are attached to the sugar in the nucleic acid by A) N-glycosidic linkage. B) N-glucoamine linkage. C) N-glycophosphate bond. D) None of the above. Show Answer Correct Answer: A) N-glycosidic linkage. 14. In *E. coli*, there is a mutation in a gene called *dnaB* that alters the helicase that normally acts at the origin of replication. Which of the following events would you expect to occur as a result of this mutation? A) Replication will require a DNA template from another source. B) No replication fork will be formed. C) Additional proofreading will occur. D) Replication will occur via RNA polymerase alone. Show Answer Correct Answer: B) No replication fork will be formed. 15. Which of the following enzyme is used to join DNAfragments:- A) Terminase. B) Endonuclease. C) Ligase. D) DNA polymerase. Show Answer Correct Answer: C) Ligase. 16. Which is the energy rich molecule required for initiation of translation A) ATP. B) GTP. C) CTP. D) AMP. Show Answer Correct Answer: B) GTP. 17. Which of the following RNA should be most abundant in animal cell? A) T-RNA. B) M-RNA. C) Mi-RNA. D) R-RNA. Show Answer Correct Answer: D) R-RNA. 18. In the genetic code, the number of codons that actually code for amino acids is: A) 64. B) 61. C) 20. D) 3. Show Answer Correct Answer: B) 61. 19. Within a double-stranded DNA molecule, adenine forms hydrogen bonds with thymine, and cytosine forms hydrogen bonds with guanine. What is the significance of the structural arrangement? A) It determines the type of protein produced. B) It allows variable width of the double helix. C) It determines the tertiary structure of a DNA molecule. D) It permits complementary base pairing. Show Answer Correct Answer: D) It permits complementary base pairing. 20. The failure in cell division after DNA replication cause A) Polyploidy. B) Hybridisation. C) Genetic variation. D) None of the above. Show Answer Correct Answer: A) Polyploidy. 21. Griffith finally proved that DNA is the genetic material A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 22. In E. coli, the lac operon gets A) Switched on when (a) lactose is present and it binds to the repressor. B) Repressor binds to operator. C) RNA polymerase binds to the operator. D) Lactose is present and it binds to RNA polymerase. Show Answer Correct Answer: C) RNA polymerase binds to the operator. 23. The unequivocal proof of DNA as the genetic material came from the studies on a A) Viroid. B) Bacterial virus. C) Bacterium. D) Fungus. Show Answer Correct Answer: B) Bacterial virus. 24. Nucleotide is A) Intron interrupted DNA. B) Double helix DNA. C) Negativity charged DNA wrapped around positively charged histone octomer. D) Satellite DNA. Show Answer Correct Answer: C) Negativity charged DNA wrapped around positively charged histone octomer. 25. DNA replication turns one strand of DNA into two new strands of DNA. What percent of each new strand is the old strand? A) Half of each new DNA is the old DNA. B) The old strand of DNA was digested, so none. C) The new DNA is entirely made up of the old DNA. D) About every sixth base comes from the old DNATagsMeselson/Stahl experiment. Show Answer Correct Answer: A) Half of each new DNA is the old DNA. ← 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