This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 33 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 33 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Peptidyl transferase enzyme is present in A) Messenger RNA. B) Transfer RNA. C) Ribosomal RNA. D) Small Nuclear RNA. Show Answer Correct Answer: C) Ribosomal RNA. 2. Which is correct about Primase- A) It is DNA polymerase. B) It is RNA polymerase. C) It is DNA dependent RNA polymerase. D) Both A and C. Show Answer Correct Answer: C) It is DNA dependent RNA polymerase. 3. Distance between two conjugative base pairs is A) 3.4nm. B) 3.2 Armstrong. C) 0.34 nm. D) None of the above. Show Answer Correct Answer: C) 0.34 nm. 4. First experimental proof for semi-conservative DNA replication was shown in: A) Streptococcus pneumonia. B) Escherichia coli. C) Neurospora crassa. D) Rattus rattus. Show Answer Correct Answer: B) Escherichia coli. 5. Which is required for protein synthesis? A) Initiation codon. B) GTP. C) Peptidyl transferase. D) All of these. Show Answer Correct Answer: D) All of these. 6. Which one-of the following is not a part of a transcription unit in DNA? A) The inducer. B) A terminator. C) A promoter. D) The structural gene. Show Answer Correct Answer: A) The inducer. 7. Synthesis of DNA is A) Spontaneous. B) Endergonic. C) Exergonic. D) Pseudogonic. Show Answer Correct Answer: B) Endergonic. 8. Select the correct expansion:SSBPs stand for ..... A) Single Stranded Binding Proteins. B) Small Subunit Binding Proteins. C) Supercoiled Strand Binding Proteins. D) Sequence Specific Binding Proteins. Show Answer Correct Answer: A) Single Stranded Binding Proteins. 9. Approximately how many base pairs (bp) are present in a typical nucleosome? A) 100 bp. B) 200 bp. C) 300 bp. D) 400 bp. Show Answer Correct Answer: B) 200 bp. 10. The year 2003 was celebrated as the 50th anniversary of the discovery of: A) Transposons by Barbara McClintock. B) Mendel's laws of inheritance. C) Structure of DNA by Watson and Crick. D) Biotechnology by Kary Mullis. Show Answer Correct Answer: C) Structure of DNA by Watson and Crick. 11. Helicase breaks hydrogen bonds between DNA strands. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 12. 30% of the bases in a sample DNA extracted from eukaryotic cell is a Denise. What percentage of cytocine is present on this DNA? A) 10%. B) 20%. C) 30%. D) 40%. Show Answer Correct Answer: B) 20%. 13. Which of the following best explains how mutations in DNA can result in the expression of anew phenotype? A) A different polypeptide is produced. B) The polarity of lRNA becomes the opposite of that of DNA. C) Nucleic acids are methylated. D) The gene is now read in the 3' to 5' direction. Show Answer Correct Answer: A) A different polypeptide is produced. 14. Select the correct process to complete:Enhancers increase the rate of ..... A) Transcription. B) Translation. C) Replication. D) Splicing. Show Answer Correct Answer: A) Transcription. 15. DNA fingerprint pattern of a child is A) Exactly similar to both the parents. B) 100% similar to father. C) 100% similar to mother. D) 50% similar to father and 50% similar to mother. Show Answer Correct Answer: D) 50% similar to father and 50% similar to mother. 16. RNA primer is removed by A) DNA-P-I. B) DNAP-II. C) DNAP-III. D) Primase. Show Answer Correct Answer: A) DNA-P-I. 17. Genetic code is A) Singlet. B) Doublet. C) Triplet. D) None of the above. Show Answer Correct Answer: C) Triplet. 18. Which of the following transcription termination technique has RNA dependent ATPase activity? A) Rho dependent. B) Intercalating agents. C) Rho independent. D) Rifampcin. Show Answer Correct Answer: A) Rho dependent. 19. Select the correct regions to complete:DNA fingerprinting relies on ..... regions. A) VNTR regions. B) Exonic coding regions. C) RRNA genes. D) Centromeric repeats only. Show Answer Correct Answer: A) VNTR regions. 20. In the Watson-Crick model of DNA, the two strands are held together by: A) Covalent bonds between purines and pyrimidines. B) Hydrogen bonds between complementary bases. C) Van der Waals forces between sugar molecules. D) Ionic bonds between phosphate groups. Show Answer Correct Answer: B) Hydrogen bonds between complementary bases. 21. In Lac operon which of the following regulates the switching on and off of the operon? A) Repressor protein. B) Lactose. C) $\beta$. D) Permease. Show Answer Correct Answer: B) Lactose. 22. Triplet codon refers to sequence of three bases on A) TRNA. B) RRNA. C) MRNA. D) All of these. Show Answer Correct Answer: C) MRNA. 23. The genome of humans contains only coding DNA. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 24. If a codon consists of 3 bases and there are 5 different kinds of bases in a nucleic acid altogether. How many codon will be there? A) 61. B) 125. C) 27. D) 64. Show Answer Correct Answer: B) 125. 25. What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized? A) Helicases and single-strand binding proteins work at the 5' end. B) DNA ligase works only in the 3' $\rightarrow$ 5' direction. C) The origins of replication occur only at the 5' end. D) DNA polymerase can join new nucleotides only to the 3' end of a pre-existing strand, and the strands are antiparallel. Show Answer Correct Answer: D) DNA polymerase can join new nucleotides only to the 3' end of a pre-existing strand, and the strands are antiparallel. ← 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