This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 42 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 42 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. To initiate the translation the mRNA first binds to ..... A) Smaller ribosome. B) Larger ribosome. C) Whole ribosome. D) No such specificity exists. Show Answer Correct Answer: A) Smaller ribosome. 2. The main enzyme in DNA replication is A) DNAse. B) Proteinase. C) RNAse. D) DNA Polymerase. Show Answer Correct Answer: D) DNA Polymerase. 3. During translation, the role of enzyme peptidyl transferase is A) Transfer of phosphate group. B) Amino acid activation. C) Peptide bond formation between adjacent amino acids. D) Binding of ribsosome subunits to mRNA. Show Answer Correct Answer: C) Peptide bond formation between adjacent amino acids. 4. In double helical structure of DNA the pitch of helix is- A) 3.4 nm. B) 0.34nm. C) 34 A. D) Both a & C. Show Answer Correct Answer: D) Both a & C. 5. What is the full form of VNTR A) Variable nucleus transfer repeat. B) Valuable of number technology repeat. C) Variable number tandem repeats. D) None of the above. Show Answer Correct Answer: C) Variable number tandem repeats. 6. Phosphoester bond is formed between A) Pentose Sugar and phosphoric acid. B) Phosphoric acid of same strand. C) Pentose Sugar of same strand. D) Nucleotides of same strand. Show Answer Correct Answer: A) Pentose Sugar and phosphoric acid. 7. During DNA replication which of the following does not act as substrates? A) DATP. B) DCTP. C) DUTP. D) DGTP. Show Answer Correct Answer: C) DUTP. 8. DNA replication takes place at ..... phase of the cellcyle. A) G1. B) S. C) G2. D) M. Show Answer Correct Answer: B) S. 9. What is the correct complimentary strand for the following DNA?ATCGAG A) TACGAG. B) ATCGAG. C) TAGCTG. D) TAGCTC. Show Answer Correct Answer: D) TAGCTC. 10. The main differences between RNA and DNA in its structure are A) The pentose sugar in RNA is ribose and it contains thymine. B) The pentose sugar in RNA is deoxyribose and it contains cytosine. C) The pentose sugar in RNA is deoxyribose and it contains uracil. D) The pentose sugar in RNA is ribose and it contains uracil. Show Answer Correct Answer: D) The pentose sugar in RNA is ribose and it contains uracil. 11. In bacterial chromosome A) There is one origin of replication. B) There are multiple sites of replication. C) There is no repair of DNA. D) Replication is very slow. Show Answer Correct Answer: A) There is one origin of replication. 12. What is the enzyme involved in the transcription of DNA? A) Helicase. B) RNA polymerase. C) DNA polymerase. D) Ligase. Show Answer Correct Answer: B) RNA polymerase. 13. Select the correct process to complete:The process by which exons join after removal of introns is ..... A) Splicing. B) Ligation. C) Recombination. D) Transduction. Show Answer Correct Answer: A) Splicing. 14. A frameshift mutation could result from A) A base insertion only. B) A base deletion only. C) A base substitution only. D) Either an insertion or a deletion of a base. Show Answer Correct Answer: D) Either an insertion or a deletion of a base. 15. Pyrimidine base present in RNA in place of thymine of DNA is A) Uracil. B) Adenine. C) Cytosine. D) Guanine. Show Answer Correct Answer: A) Uracil. 16. In a n/RNA molecule, untranslated regions (UTRs) are present at A) 5'-end (before start codon). B) 3'-end (after stop codon). C) Both (a) and (b). D) 3'-end only. Show Answer Correct Answer: C) Both (a) and (b). 17. The number of base substitution possible in amino acid codons is A) 261. B) 2645. C) 535. D) 549. Show Answer Correct Answer: D) 549. 18. The following is a section of mRNA:AUC-CUA-ACC-UAG What's the anticodon for the third amino acid? A) TGG. B) UGG. C) ACC. D) AUG. Show Answer Correct Answer: B) UGG. 19. The initiator codons are A) AUG. B) GUG. C) Both of these. D) None of these. Show Answer Correct Answer: C) Both of these. 20. The distance between a base pair in a helix is approximately ..... A) 0.34 nm. B) 3.4 nm. C) 34 nm. D) 0.034 nm. Show Answer Correct Answer: A) 0.34 nm. 21. Chargaff rule states A) A = C. B) A = T. C) T = G. D) C = T. Show Answer Correct Answer: B) A = T. 22. In sickle-cell anaemia glutamic acid is replaced by valine. Which one of the following triplet codes for valine? A) G U G. B) G A A. C) A A G. D) G G G. Show Answer Correct Answer: A) G U G. 23. For a repressible operon to be transcribed, which of the following must occur? A) RNA polymerase and the active repressor must be present. B) RNA polymerase cannot be present, and the repressor must be inactive. C) RNA polymerase must bind to the promoter, and the repressor must be inactive. D) A corepressor must be present. Show Answer Correct Answer: C) RNA polymerase must bind to the promoter, and the repressor must be inactive. 24. Who proved experimentally that DNA is genetic material? A) O. Avery and Colleagues. B) J. Waston and F. Crick. C) W. Arber and Colleagues. D) G. Mendel. Show Answer Correct Answer: A) O. Avery and Colleagues. 25. What is the main difference between prokaryotic and eukaryotic transcription? A) Eukaryotes have one RNA polymerase. B) Prokaryotes have introns. C) Eukaryotes have three RNA polymerases. D) Prokaryotes have a nucleus. Show Answer Correct Answer: C) Eukaryotes have three RNA polymerases. ← 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