This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 25 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 25 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Why were fragments like those now called Okazaki fragments expected before they were discovered? A) DNA replicates in the 5' to 3' direction. B) The replication fork moves forward along a double-stranded DNA molecule. C) DNA replicates in the 3' to 5' direction on the lagging strand. D) RNA primase places short RNA primer sequences along the DNA molecule. Show Answer Correct Answer: B) The replication fork moves forward along a double-stranded DNA molecule. 2. In a double-stranded DNA molecule, if one strand has the sequence 5'-ATGCGT-3', the complementary strand will have: A) 5'-TACGCA-3'. B) 3'-TACGCA-5'. C) 5'-ACGCAT-3'. D) 3'-ACGCAT-5'. Show Answer Correct Answer: B) 3'-TACGCA-5'. 3. E. coli cells grown on $^{15}N$ $^{14}N$ A) One high-density and one intermediate-density band. B) One high-density and one low-density band. C) One low-density and one intermediate-density band. D) One intermediate-density band. Show Answer Correct Answer: C) One low-density and one intermediate-density band. 4. Who proposed the semiconservative nature of DNA A) Fredrick griffith. B) Francis crick. C) Darwin. D) Meselson and stahl. Show Answer Correct Answer: B) Francis crick. 5. Which of the following vectors are widely used in HGP? A) Plasmid and cosmid. B) Lamba phage and M13 vectors. C) Phagemid and shuttle vectors. D) BAC and YAC. Show Answer Correct Answer: D) BAC and YAC. 6. The terms cistron, recon and muton were proposed by A) Benzer. B) Morgan. C) Lederberg. D) Johansen. Show Answer Correct Answer: A) Benzer. 7. Reverse transcription was discovered by A) Beadle and Tatum. B) Watson and Crick. C) Khorana. D) Temin and Baltimore. Show Answer Correct Answer: D) Temin and Baltimore. 8. Gyrase helps in relaxing supercoils of DNA. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 9. The ribosome has three binding sites (A, P, E) for tRNA molecules. Which of the following is NOT the correct statement regarding these sites? A) The A site binds to an incoming aminoacyl-tRNA. B) The P site codon is occupied by peptidyl-tRNA (an amino acid containing tRNA). C) The E site is occupied by empty t-RNA as it is exiting the ribosome. D) None of the Above. Show Answer Correct Answer: D) None of the Above. 10. A frameshift mutation is caused by: A) Substitution of one base for another. B) Insertion or deletion of one or two bases. C) Insertion or deletion of three bases. D) Duplication of a chromosome segment. Show Answer Correct Answer: B) Insertion or deletion of one or two bases. 11. If the total amount of adenine and thymine in a double-stranded DNA is 45%, the amount of guanine in this DNA will be A) 22.5%. B) 27.5%. C) 45%. D) 55%. Show Answer Correct Answer: B) 27.5%. 12. Which of the following be named for DNA produced from RNA A) A-DNA. B) B-DNA. C) C-DNA. D) Z-DNA. Show Answer Correct Answer: C) C-DNA. 13. The begining of understanding genetic transformation in bacteria was made by: A) Frederich Griffth. B) Hershy and Chase. C) Watson and Crick. D) T .H Morgan. Show Answer Correct Answer: A) Frederich Griffth. 14. Select the correct cap to complete:The 5' end of mRNA is capped with ..... A) Methyl guanosine (m7G cap). B) Poly-A tail. C) 5' phosphate only. D) 3' cap. Show Answer Correct Answer: A) Methyl guanosine (m7G cap). 15. The biochemical nature of transforming principle was defined by A) Griffith. B) Avery, Macleod, McCarty. C) Watson and Crick. D) Taylor. Show Answer Correct Answer: B) Avery, Macleod, McCarty. 16. 5' end of DNA and RNA contains which chemical group A) OH. B) PO4. C) SO4. D) None of these. Show Answer Correct Answer: B) PO4. 17. Peptide bond formation is catalyzed by A) TRNA. B) RRNA (23S). C) MRNA. D) DNA. Show Answer Correct Answer: B) RRNA (23S). 18. During translation, the ..... site within the ribosome holds the growing amino acids chain while the ..... site holds the next amino acid to be added to the chain. A) A, P. B) P, A. C) A, B. D) B, A. Show Answer Correct Answer: B) P, A. 19. Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology? A) Genetic code is not ambiguous. B) Genetic code is redundant. C) Genetic code is nearly universal. D) Genetic code is specif. Show Answer Correct Answer: C) Genetic code is nearly universal. 20. What two scientists are given credit for discovering the structure of DNA? A) Hershey and Chase. B) Watson and Crick. C) McCarty and MacLeod. D) Meselson and StahlTagsDNA replication experiments. Show Answer Correct Answer: B) Watson and Crick. 21. Which molecule brings amino acids to the ribosomes for assembling into proteins? A) MRNA. B) RRNA. C) TRNA. D) DNA. Show Answer Correct Answer: C) TRNA. 22. Select the correct term to complete: ..... proposed the operon concept. A) Jacob and Monod. B) Watson and Crick. C) Beadle and Tatum. D) Meselson and Stahl. Show Answer Correct Answer: A) Jacob and Monod. 23. Who amongst the following 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) Measelson and Stahl. Show Answer Correct Answer: D) Measelson and Stahl. 24. Which base always pairs with guanine? A) Adenine. B) Cytosine. C) Thymine. D) Uracil. Show Answer Correct Answer: B) Cytosine. 25. Why does a new DNA strand elongate only in the 5' to 3' direction during DNA replication? A) DNA polymerase can add nucleotides only to the free 3' end. B) The polarity of the DNA molecule prevents addition of nucleotides at the 3' end. C) DNA polymerase begins adding nucleotides at the 5' end of the template. D) Replication must progress toward the replication fork. Show Answer Correct Answer: A) DNA polymerase can add nucleotides only to the free 3' end. ← 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