This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following statements is correct regarding ribosomes? A) Most of a cell's DNA molecule are stored there. B) Complete polypeptide is released from there. C) MRNAs are produced there. D) DNA replication takes place there. Show Answer Correct Answer: B) Complete polypeptide is released from there. 2. What is the primary function of a terminator in a transcription unit? A) Terminates translation. B) Binds RNA polymerase. C) Ends transcription. D) Initiates transcription. Show Answer Correct Answer: C) Ends transcription. 3. Isotopes used in proving semiconservative replication of DNA were A) $^{14}$N $^{14}$C. B) $^{14}$N $^{15}$N. C) $^{14}$N $^{31}$P. D) $^{14}$C $^{31}$P. Show Answer Correct Answer: B) $^{14}$N $^{15}$N. 4. Assertion (A):tRNA is called an 'adapter' Reason(R):tRNA on one hand bind to a specific amino acid and on the other hand reads the codon of the amino acid bound to it through its anticodon A) Both assertion and reason are true and the reason is the correct explanation of assertion. B) Both assertion and reason are true but the reason is not the correct explanation of assertion. C) Assertion is true but reason is false. D) Both assertion and reason are false. Show Answer Correct Answer: A) Both assertion and reason are true and the reason is the correct explanation of assertion. 5. Recognition sequence for transcription in prokaryotes is A) TATATAT. B) TATAAT. C) TATAAAT. D) CAAT. Show Answer Correct Answer: B) TATAAT. 6. Which of the following does not affect DNA replication? A) Antiparallel nature of DNA. B) End specificity of polymerase. C) SSB protein. D) Helicase. Show Answer Correct Answer: C) SSB protein. 7. Termination of polypeptide chain is brought about by A) UUG, UAG and UCG. B) UCG, GCG and ACC. C) UAA, UAG and UGA. D) UUG, UGC and UCA. Show Answer Correct Answer: C) UAA, UAG and UGA. 8. What are UTRs? A) They are coding part found on DNA. B) They are non coding part found on gene. C) They are coding part found on mRNA. D) They are non-coding part found on mRNA. Show Answer Correct Answer: D) They are non-coding part found on mRNA. 9. How many percent of genome code for proteins? A) < 1%. B) < 3%. C) < 2 %. D) < 5%. Show Answer Correct Answer: C) < 2 %. 10. The Human Genome Project as megaproject was a 13 year project coordinated by the A) U.S. Department of Energy. B) National Institute of Health. C) U.S. Department of Molecular Biology. D) Both (a) and (b). Show Answer Correct Answer: D) Both (a) and (b). 11. DNA-dependent RNA polymerase catalyzes transcription on one strand of the DNA which is called the A) Template strand. B) Coding strand. C) Alpha strand. D) Anti strand. Show Answer Correct Answer: A) Template strand. 12. DNA has genetic properties was revealed for the first time by A) Griffith. B) Avery. C) Wilkins. D) Chargaff. Show Answer Correct Answer: B) Avery. 13. Which of the following composes the ribosomes? A) MRNA. B) TRNA. C) RRNA. D) DNA. Show Answer Correct Answer: C) RRNA. 14. Which of the following set of options is used in translation? A) HnRNA, rRNA, tRNA. B) MRNA, tRNA, hnRNA. C) MRNA, tRNA, rRNA. D) HnRNA, tRNA, rRNA. Show Answer Correct Answer: C) MRNA, tRNA, rRNA. 15. The codon AUG is A) Ochre. B) Amber. C) Initiation codon. D) Termination codon. Show Answer Correct Answer: C) Initiation codon. 16. Which is catalytically active- A) DNA. B) RNA. C) Protein. D) Both B and C. Show Answer Correct Answer: D) Both B and C. 17. Under which conditions B-DNA is converted into A and C A) High temperature. B) Low temperature. C) Low humidity. D) High humidity. Show Answer Correct Answer: C) Low humidity. 18. Removal of introns and joining of exons in a defined order during transcription is called: A) Looping. B) Inducing. C) Slicing. D) Splicing. Show Answer Correct Answer: D) Splicing. 19. The lactose operon is likely to be transcribed when ..... ? ..... A) There is glucose but no lactose in the cell. B) The cyclic AMP levels are low. C) The cyclic AMP and lactose levels are both high within the cell. D) There is more glucose in the cell than lactose. Show Answer Correct Answer: C) The cyclic AMP and lactose levels are both high within the cell. 20. ..... helps in the removal of RNA primer A) RNA polymerase. B) DNA polymerase I. C) DNA polymerase II. D) DNA polymerase III. Show Answer Correct Answer: B) DNA polymerase I. 21. TRNA has a cloverleaf structure. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 22. Attach the codons with their respective amino acids and choose the correct answer. A UUU 1. Serine B GGG 2. Methionine C UCU 3 Phenylalanine D CCG 4 Glycine E AUG 5 Proline A) 2 4 1 5 2. B) 3 4 1 5 2. C) 3 1 4 5 2. D) 2 4 1 3 5. Show Answer Correct Answer: B) 3 4 1 5 2. 23. DNA is present in A) Mitochondria. B) Nucleus. C) Chloroplast. D) All of these. Show Answer Correct Answer: D) All of these. 24. What determines the nucleotide sequence of the newly synthesized strand during DNA replication? A) The particular DNA polymerase catalyzing the reaction. B) The relative amounts of the four nucleoside triphosphates in the cell. C) The nucleotide sequence of the template strand. D) The primase used in the reaction e. the arrangement of histones in the sugar phosphate backbone. Show Answer Correct Answer: C) The nucleotide sequence of the template strand. 25. The basis of DNA fingerprinting is A) Double helix. B) Errorrs in base sequence. C) Polymorphism in sequence. D) DNA replication. Show Answer Correct Answer: C) Polymorphism in sequence. ← 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 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 10Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books