This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 21 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Who proposed the double helical structure of DNA A) Meselson and Stahl. B) Taylor et.al. C) Watson and Crick. D) Hershey and Chase. Show Answer Correct Answer: C) Watson and Crick. 2. Find out the wrong statement about heterochromatin: A) It is late replicating. B) It is transcriptionally active. C) It stains dark. D) It is densely packed. Show Answer Correct Answer: B) It is transcriptionally active. 3. A DNA nucleotide may be made up of a phosphate group, along with ..... A) Deoxyribose sugar and uracil. B) Ribose sugar and adenine. C) Deoxyribose sugar and thymine. D) Ribose sugar and cytosine. Show Answer Correct Answer: C) Deoxyribose sugar and thymine. 4. The enzyme, which helps to cut one strand of DNA duplex to release tension of coiling of two strands is: A) DNA ligase. B) DNA polymerase-I. C) Topoisomerase. D) Helicase. Show Answer Correct Answer: C) Topoisomerase. 5. A sequence of three RNA base can function as-********A. Codon********B. Gene********C. Anticodon********D. Nucleosides A) A, C. B) A, B, C, D. C) B, C, D. D) A, B, C. Show Answer Correct Answer: A) A, C. 6. If E. coli was allowed to grow for 120 minutes then what would be the proportions of light and hybrid densities DNA molecule? A) 64. B) 32. C) 16. D) 8. Show Answer Correct Answer: A) 64. 7. Which of the following statements describes the process of transformation in bacteria? A) A strand of RNA is created from a DNA molecule. B) A strand of DNA is created from an RNA molecule. C) Bacterial cells are infected by a phage DNA molecule. D) External DNA is taken into a cell, becoming part of the cell's genome. Show Answer Correct Answer: D) External DNA is taken into a cell, becoming part of the cell's genome. 8. RNA editing occurs in A) Prokaryotes. B) Eukaryotes. C) Viruses only. D) None. Show Answer Correct Answer: B) Eukaryotes. 9. Who amongst the following scientists 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 Stah. Show Answer Correct Answer: D) Meselson and Stah. 10. The sequence of structural genes in lac operon is A) Lac A, Lac Y, Lac Z. B) Lac A, Lac Z, Lac Y. C) Lac Y, Lac A, Lac A. D) Lac Z, Lac Y, Lac A. Show Answer Correct Answer: D) Lac Z, Lac Y, Lac A. 11. DNA fingerprinting procedures use ..... to cut a DNA sample into segments. A) Splicer. B) Nitrogen bases. C) Agarose gel. D) Restriction enzymes. Show Answer Correct Answer: D) Restriction enzymes. 12. Name the RNA molecules which is used to carry genetic information copied from DNA? A) TRNA. B) MRNA. C) RRNA. D) SnRNA. Show Answer Correct Answer: B) MRNA. 13. Coupled transcription and translation found in A) Prokaryotes. B) E.coli. C) Both A&B. D) Plants. Show Answer Correct Answer: C) Both A&B. 14. RNA act as genetic material in A) Plants. B) Animals. C) Retro virus. D) Bacteria. Show Answer Correct Answer: C) Retro virus. 15. Which scientist determined that guanine pairs with cytosine? A) Chargaff. B) Crick. C) Watson. D) Wilkins. Show Answer Correct Answer: A) Chargaff. 16. Translation happens in the- A) Nucleus. B) Ribosome. C) Chloroplast. D) Smooth Endoplasmic Reticulum. Show Answer Correct Answer: B) Ribosome. 17. The process of creating a protein from RNA is called A) Transcription. B) Translation. C) Replication. D) Reverse transcription. Show Answer Correct Answer: B) Translation. 18. Characteristic(s) of most DNA is / are ..... A. A pairs with T by 2 hydrogen bonds ..... B. Antipolarity of complementary chains ..... C. 20 $A^0$ A) A, C. B) A, B, C, D. C) B, C, D. D) A, B, C. Show Answer Correct Answer: B) A, B, C, D. 19. HnRNA is found only in prokaryotes. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 20. If you were to observe the activity of methylated DNA, you would expect it to A) Be replicating nearly continuously. B) Be very actively transcribed and translated. C) Have turned off or slowed down the process of transcription. D) Be unwinding in preparation for protein synthesis. Show Answer Correct Answer: C) Have turned off or slowed down the process of transcription. 21. The amino acid attaches to the tRNA at its A) 5'-end. B) 3'-end. C) Anti codon site. D) DHU loop. Show Answer Correct Answer: B) 3'-end. 22. The polarity with 5'-3' has the sequence similar strand A) MRNA. B) DNA. C) RRNA. D) Templates strand. Show Answer Correct Answer: A) MRNA. 23. The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix A) The antiparallel nature. B) The semiconservativenature. C) Uniform width throughout the DNA. D) Uniform length in all DNA. Show Answer Correct Answer: C) Uniform width throughout the DNA. 24. In post transcription stage, which among the following process is not involved. A) Capping using Poly adenyl group. B) Capping with methyl guanosine triphosphate group. C) Splicing. D) Slicing. Show Answer Correct Answer: A) Capping using Poly adenyl group. 25. Who proposed semi conservative mode of replication in DNA through Experimental study in E.coli? A) Griffith. B) Hershy and Chase. C) Avery and McCleod. D) Meselson and Stahl. Show Answer Correct Answer: D) Meselson and Stahl. ← 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