This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 11 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Sickle cell anemia results from a single base substitution in a gene, thus it is an example of A) Point mutation. B) Frame-shift muttion. C) Silent mutation. D) Both (a) and (b). Show Answer Correct Answer: A) Point mutation. 2. Who proposed central dogma? A) Crick. B) Beadle and Tatum. C) Klug. D) Watson and Crick. Show Answer Correct Answer: A) Crick. 3. In prokaryotes, the first amino acid in the polypeptide chain is A) Methionine. B) N-methyl methionine. C) N-formyl methionine. D) All of these. Show Answer Correct Answer: C) N-formyl methionine. 4. What were the main criteria taken under consideration for the experiment by Hershey and Chase? A) DNA contains phosphorus, protein contains sulfur. B) Protein contains phosphorus, DNA contains sulfur. C) Both DNA and protein contains phosphorus and not sulphur. D) Both DNA and protein contains sulfur and not phosphorus. Show Answer Correct Answer: A) DNA contains phosphorus, protein contains sulfur. 5. What is the major difference between bacterial chromosomes and eukaryotic chromosomes? A) Bacteria usually have a single circular chromosome whereas eukaryotes have several linear chromosomes. B) There is no difference between bacterial and eukaryotic chromosomes. C) Eukaryotes have a single circular chromosome whereas bacteria have several linear chromosomes. D) Bacterial chromosomes have much more protein associated with the DNA than eukaryotes. Show Answer Correct Answer: A) Bacteria usually have a single circular chromosome whereas eukaryotes have several linear chromosomes. 6. What sugar is in DNA? A) Deoxyribose. B) Ribose. C) Oxyribose. D) DeoxyoseTagsDNA Structure. Show Answer Correct Answer: A) Deoxyribose. 7. While analysing the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were Adenine = 29%, Guanine = 17%, Cytosine = 32%, Thymine = 17%. Considering the Chargaffs rule it can be concluded that A) No conclusion can be drawn. B) It is a double-stranded linear DNA. C) It is single-stranded DNA. D) T is a double-stranded circular DNA. Show Answer Correct Answer: C) It is single-stranded DNA. 8. The bacterial strains change from one form to another, from R strain into S strain. This is known as A) Transcription. B) Translation. C) Transduction. D) Transformation. Show Answer Correct Answer: D) Transformation. 9. According to chargaff's rule, in a DNA molecule A) The amount of adenine and thymine= the amount of guanine and cytosine. B) The amount of adenine and cytosine= the amount of guanine and cytosine. C) The amount of adenine and guanine= the amount of thymine and cytosine. D) All of these. Show Answer Correct Answer: C) The amount of adenine and guanine= the amount of thymine and cytosine. 10. What enzyme breaks the hydrogen bonds? A) Helicase. B) Polymerase. C) Topoisomerase. D) Ligase. Show Answer Correct Answer: A) Helicase. 11. Find out the wrongly matched pair with respect to lac operon. A) Inducer-Lactose. B) Lac z-codes for repressor protein. C) Presence of glucose-Switches off the lac operon. D) Repressor protein-Negative control of lac operon. Show Answer Correct Answer: B) Lac z-codes for repressor protein. 12. Telomerase is a protein-only enzyme. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 13. In DNA, the two purines are ..... , and the two pyrimidines are ..... A) Adenine and thymine cytosine and guanine. B) Adenine and guanine cytosine and thymine. C) Cytosine and thymine adenine and guanine. D) Adenine and cytosine guanine and thymine. Show Answer Correct Answer: B) Adenine and guanine cytosine and thymine. 14. What nitrogen base is found in RNA but not in DNA? A) Adenine. B) Guanine. C) Cytosine. D) Uracil. Show Answer Correct Answer: D) Uracil. 15. Which of the following base pair sequences could be produced in DNA replication? A) 5' AGTCUT 3' 3' TCUGTA 5'. B) 5' AGTCAT 3' 3' TCAGTA 5'. C) 5' AGTCAT 3' 3' CTGACG 5'. D) 5' AGTCAT 3' 3' UCAGUA 5'. Show Answer Correct Answer: B) 5' AGTCAT 3' 3' TCAGTA 5'. 16. Who observed the constant ratio between Adenine and Thymine? A) Erwin Chargaff. B) Gregory Mendel. C) James Watson. D) Charles Darwin. Show Answer Correct Answer: A) Erwin Chargaff. 17. The promoter site and the terminator site for transcription are located at: A) 3' (downstream) end and 5' (upstream) end, respectively of the transcription unit. B) 5' (upstream) end and 3' (downstream) end, respectively of the transcription unit. C) The 5' (upstream) end. D) The 3' (downstream) end. Show Answer Correct Answer: B) 5' (upstream) end and 3' (downstream) end, respectively of the transcription unit. 18. The enzyme that unzips the DNA to prepare for replication A) Helicase. B) Replicase. C) Polymerase. D) Synthase. Show Answer Correct Answer: A) Helicase. 19. If in a scenario, the tRNA molecules present in the cell are mutated such that the DHU loop is not functional then which of the following step will be directly affected? A) Translation. B) Polypeptide synthesis. C) Binding of Larger subunit of ribosome to initiation complex. D) Charging of tRNA. Show Answer Correct Answer: D) Charging of tRNA. 20. What is the first step in the transcription process? A) Elongation. B) Termination. C) Initiation. D) Splicing. Show Answer Correct Answer: C) Initiation. 21. Experimental evidence supporting concept of triplet genetic code was first provided by A) Watson. B) Crick. C) Michaelis and Menten. D) Beadle and Tatum. Show Answer Correct Answer: B) Crick. 22. What methionine code for A) UGA. B) AUG. C) UAA. D) CGA. Show Answer Correct Answer: B) AUG. 23. Replication fork is the junction between the two ..... A) Newly separated DNA strands and the unreplicated DNA. B) Newly separated DNA strands and newly synthesized DNA strands 1. C) Newly synthesized DNA. D) Unreplicated DNA. Show Answer Correct Answer: A) Newly separated DNA strands and the unreplicated DNA. 24. Nonsense codon is responsible for A) Elongation of polypeptide chain. B) Termination of protein synthesis. C) Putting a wrong amino acid. D) Hydrolysis of GTP. Show Answer Correct Answer: B) Termination of protein synthesis. 25. What is the process of removing introns from RNA called? A) Splicing. B) Transcription. C) Tailing. D) Capping. Show Answer Correct Answer: A) Splicing. ← 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