This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 35 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 35 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Eukaryotic telomeres replicate differently than the rest of the chromosome. This is a consequence of which of the following? A) The evolution of telomerase enzyme. B) DNA polymerase that cannot replicate the leading strand template to its 5' end. C) Gaps left at the 5' end of the lagging strand because of the need for a 3' onto which nucleotides can attach. D) Gaps left at the 3' end of the lagging strand because of the need for a primer. Show Answer Correct Answer: C) Gaps left at the 5' end of the lagging strand because of the need for a 3' onto which nucleotides can attach. 2. Control of gene expression in prokaryotes take place at the level of A) DNA-replication. B) Transcription. C) Translation. D) None of the above. Show Answer Correct Answer: B) Transcription. 3. If the DNA of this virus was labelled with $^{32}$P and the protein of the virus was labelled with $^{35}$S, which molecule(s) would be present inside the cells? A) $^{35}$S and $^{32}$P. B) $^{35}$S only. C) $^{32}$P only. D) Neither molecule would be present inside the cell. Show Answer Correct Answer: C) $^{32}$P only. 4. Which is the primary purpose of using restriction enzymes in gel electrophoresis? A) It allows the strands of DNA to be cut into various lengths for testing. B) It restricts the number of base pairs that can be tested in a sample. C) It makes the testing simpler by moving the strands into the gel faster. D) It charges the DNA strands. Show Answer Correct Answer: A) It allows the strands of DNA to be cut into various lengths for testing. 5. If the sequence of bases in DNA is ATTCGATG, then the sequence of bases in its transcript will be A) CAUCGAAU. B) UAAGCUAC. C) GUAGCUUA. D) AUUCGAUG. Show Answer Correct Answer: B) UAAGCUAC. 6. What is the approximate number of base pairs present in a DNA molecule with length 34 nm? A) 340. B) 100. C) 68. D) 34. Show Answer Correct Answer: B) 100. 7. A bacterium with completely radioactive DNAwas allowed to replicate in a non-radioactivemedium for two generation what % of the bacteriashould contain radioactive DNA:- A) 100 %. B) 50 %. C) 25 %. D) 12.5 %. Show Answer Correct Answer: B) 50 %. 8. In 125 amino acid sequence if the codon for 25th amino acid is mutated to UAA, then A) A polypeptide of 24 amino acids is formed. B) A polypeptide of 124 amino acids is formed. C) No polypeptides are formed. D) A polypeptide of 25 amino acids is formed. Show Answer Correct Answer: A) A polypeptide of 24 amino acids is formed. 9. What is the genetic material for the majority of organisms? A) Carbohydrates. B) RNA. C) DNA. D) Proteins. Show Answer Correct Answer: C) DNA. 10. Anticodons-mRNA A) 5' end. B) 3' end. C) T VC loop. D) DHUloop. Show Answer Correct Answer: B) 3' end. 11. Template strand is decided based on A) Promoter. B) Coding seqeuence of DNA. C) Telomere. D) Centromere. Show Answer Correct Answer: A) Promoter. 12. Name the chemical substance used as the source of nitrogen by Meselson and Stahl A) NH4Cl. B) NH4OH. C) NH3. D) None of the above. Show Answer Correct Answer: A) NH4Cl. 13. Which of the following components is required for DNA replication? A) RNA primer. B) Messenger RNA. C) Sucrases. D) Ribosomes. Show Answer Correct Answer: A) RNA primer. 14. In prokaryotes, which of the following statement is incorrect with relation to transcription? A) MRNA does not require processing to become active. B) Transcription and translation in same compartment. C) MRNA requires processing to become active. D) Translation may begin much before mRNA is fully transcribed. Show Answer Correct Answer: C) MRNA requires processing to become active. 15. When synthesizing a new DNA strand, DNA polymerase writes ..... A) 5' to 3'. B) 3' to 5'. C) 3' to 5' or 5' to 3'. D) None of the above. Show Answer Correct Answer: A) 5' to 3'. 16. Semiconservative replication involves a template. What is the template? A) An RNA molecule. B) One strand of the DNA molecule. C) Single-stranded binding proteins. D) DNA polymerase. Show Answer Correct Answer: B) One strand of the DNA molecule. 17. The building blocks for a new DNA molecule are A) Deoxyribose nucleoside monophosphates. B) Deoxyribose nucleoside diphosphates. C) Deoxyribose nucleoside triphosphates. D) Deoxyribose nucleoside tetraphosphates. Show Answer Correct Answer: C) Deoxyribose nucleoside triphosphates. 18. DNA replication in bacteria occurs in A) G1 Phase. B) G2 Phase. C) S Phase. D) M Phase. Show Answer Correct Answer: A) G1 Phase. 19. Lagging strand A) Replication is continuous on strand. B) Small sections of DNA formed during discontinuous replication. C) Replication is discontinuous on strand. D) None of the above. Show Answer Correct Answer: C) Replication is discontinuous on strand. 20. Which of the following statements about the structure of DNA is false? A) The width of the DNA molecule is variable since it can accommodate nucleotides containing varying number of nitrogen-based 'rings'. B) Hydrogen bonds determine which nitrogenous bases can pair together. C) A total of 10 pairs of nuecleotides are included in each complete 'turn' of the double helix. D) Minor and major grooves alternate along the length of the molecule. Show Answer Correct Answer: A) The width of the DNA molecule is variable since it can accommodate nucleotides containing varying number of nitrogen-based 'rings'. 21. Select the correct requirement to complete:DNA polymerase cannot initiate synthesis; it needs ..... A) RNA primer. B) DNA ligase. C) Helicase. D) Topoisomerase. Show Answer Correct Answer: A) RNA primer. 22. What are telomeres? A) The ends of linear chromosomes. B) The sites of origin of DNA replication. C) The structures that hold two sister chromatids together. D) Enzymes that elongate the DNA strand during replication. Show Answer Correct Answer: A) The ends of linear chromosomes. 23. Which enzyme catalyzes the elongation of a DNA strand in the 5' $\rightarrow$ 3' direction? A) DNA polymerase I. B) DNA polymerase III. C) Helicase. D) Topoisomerase. Show Answer Correct Answer: B) DNA polymerase III. 24. The chemical nature of a gene is A) Protein. B) Acid. C) Base. D) None of these. Show Answer Correct Answer: B) Acid. 25. The flow of information from DNA to mRNA and then to proteins is called A) Transcription. B) Translation. C) Genetic code. D) Central dogma. Show Answer Correct Answer: D) Central dogma. ← 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