This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 18 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Transformation A) A change in phenotype due to the assimilation of external DNA by a cell. B) A change in genotype due to the assimilation of external DNA by a cell. C) A change in genotype and phenotype due to the assimilation of external DNA by a cell. D) A change in DNA. Show Answer Correct Answer: C) A change in genotype and phenotype due to the assimilation of external DNA by a cell. 2. Which of the following is odd in reference of genetic code? A) Valine. B) Alanine. C) Glycine. D) Tryptophan. Show Answer Correct Answer: D) Tryptophan. 3. Why both the strands of DNA are not transcribed? A) Both strands will code for RNA with different sequence. B) Code for two different proteins,. C) Complementary strands produced form a double stranded RNA. D) All of the above. Show Answer Correct Answer: D) All of the above. 4. What is the number of bases in an average gene A) 3000. B) 2000. C) 5000. D) 4000. Show Answer Correct Answer: A) 3000. 5. In Meselson and Stahl's experiment, ..... generation(s) after cells were transferred from heavy-nitrogen medium to light nitrogen medium, all of the DNA was of hybrid density. A) I generation. B) 2nd generation. C) 3rd generation. D) 4th generation. Show Answer Correct Answer: A) I generation. 6. The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ..... direction. A) Only 5' $\rightarrow$ 3'. B) Only 3' $\rightarrow$ 5'. C) Both (a) and (b). D) None of these. Show Answer Correct Answer: A) Only 5' $\rightarrow$ 3'. 7. Percentage of (G + C) is A) $\frac{G+C}{\left(A+G+T+C\right)}\times100$. B) $\frac{100}{\left(A+T\right)}\times G+C$. C) $\frac{G+C}{\left(A+G+T+C\right)}$. D) $\frac{\left(G+C\right)\\times\left(A+T\right)}{100}$. Show Answer Correct Answer: A) $\frac{G+C}{\left(A+G+T+C\right)}\times100$. 8. Which scientist(s) determined that DNA replication was a semi-conservative process? A) Meselson & Stahl. B) Griffith. C) Hershey & Chase. D) Chargaff. Show Answer Correct Answer: A) Meselson & Stahl. 9. Which scientists determined that DNA was a double helix? A) Franklin & Watkins. B) Hershey & Chase. C) Meselson & Stahl. D) Watson & Crick. Show Answer Correct Answer: D) Watson & Crick. 10. Mark the one, which is NOT the transcription inhibitor in eukaryotes. A) Actinomycin D. B) Acridine dye. C) Rifampicin. D) Rho factor. Show Answer Correct Answer: D) Rho factor. 11. In eukaryotic gene expression, the process of adding a methyl guanosine cap occurs during: A) Transcription initiation. B) RNA processing. C) Translation. D) DNA replication. Show Answer Correct Answer: B) RNA processing. 12. Transcription unit consists of A) Promoter, structural gene, terminator. B) Origin, promoter. C) Enhancer, operator. D) Codon only. Show Answer Correct Answer: A) Promoter, structural gene, terminator. 13. Which isotopes were used by Meselson and Stahl in their experiment to prove semiconservative DNA replication? A) Carbon-14 and Nitrogen-15. B) Hydrogen-1 and Oxygen-18. C) Oxygen-16 and Nitrogen-14. D) Nitrogen-15 and Nitrogen-14. Show Answer Correct Answer: D) Nitrogen-15 and Nitrogen-14. 14. RNA required for splicing ..... A) Hn rna. B) Sn rna. C) M rna. D) T rna. Show Answer Correct Answer: B) Sn rna. 15. The major approaches used in HGP for identifying were A) Sequence annotation. B) Expressed Sequence Tags. C) Both of the above. D) None of the above. Show Answer Correct Answer: C) Both of the above. 16. Which codon is not an indicator of completion of protein synthesis? A) UAG. B) AUG. C) UAA. D) UGA. Show Answer Correct Answer: B) AUG. 17. Which is the last human chromosome to be completely sequenced? A) Chromosome Y. B) Chromosome X. C) Chromosome 1. D) Chromosome 21. Show Answer Correct Answer: C) Chromosome 1. 18. If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on the complementary strand? A) ATGCATGCA. B) TACTACGT. C) AUGCAUGCA. D) UACGUACGU. Show Answer Correct Answer: B) TACTACGT. 19. What is base complementarity A) Purine = pyrimidine. B) Purine = pyrimidine. C) A=T, . G=C. D) A=G T=C. Show Answer Correct Answer: C) A=T, . G=C. 20. Chargaff's rules of base pairing states that A) The ratio of purine to pyrimidines is roughly equal in all tested organism. B) The ratio of A to T is roughly equal in all tested organisms. C) The ratio of A + T and G+ C is roughly equal in all tested organisms. D) Both1 and 2. Show Answer Correct Answer: D) Both1 and 2. 21. In *E. coli*, which enzyme catalyzes the elongation of a new DNA strand in the 5' $\rightarrow$ 3' direction? A) Helicase. B) DNA ligase. C) DNA polymerase III. D) Primase. Show Answer Correct Answer: C) DNA polymerase III. 22. If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand? A) ATGCATGCA. B) AUGCAUGCA. C) TACTACGT. D) UACGUACGU. Show Answer Correct Answer: C) TACTACGT. 23. All the living organism on earth has DNA as their genetic material A) True. B) Flase. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 24. The role of DNA polymerases in DNA replication is to ..... A) Synthesize an RNA primer to initiate DNA strand synthesis. B) Attach free nucleotides to the new DNA strand. C) Separate the two strands of DNA. D) Link together short strands of DNA. Show Answer Correct Answer: B) Attach free nucleotides to the new DNA strand. 25. RNA stores genetics information in A) Prokaryotes. B) Virus. C) Protozoa. D) Eukaryotes. Show Answer Correct Answer: B) Virus. ← 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