This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 28 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 28 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In transcription in eukaryotes, heterogeneous nuclear RNA (hnRNA) is transcribed by: A) RNA polymerase II. B) RNA polymerase I. C) RNA polymerase III. D) All of these. Show Answer Correct Answer: A) RNA polymerase II. 2. A DNA molecule has 240bp and 30% guanosine, how many adenine present in this molecule of DNA? A) 120 nucleotide. B) 80 nucleotide. C) 40 nucleotide. D) 160 nucleotide. Show Answer Correct Answer: C) 40 nucleotide. 3. In *E. coli*, to repair a thymine dimer by nucleotide excision repair, in which order do the necessary enzymes act? A) Nuclease, DNA polymerase, RNA primase. B) DNA ligase, nuclease, helicase. C) Nuclease, DNA polymerase, DNA ligase. D) Helicase, DNA polymerase, DNA ligase. Show Answer Correct Answer: C) Nuclease, DNA polymerase, DNA ligase. 4. Amino acid acceptor end of tRNA lies at: A) DHU loop. B) 3' end. C) 5' end. D) TVC loop. Show Answer Correct Answer: B) 3' end. 5. Which of the following characteristics of eukaryotic telomeres cause them to replicate differently than the rest of the chromosome? A) They are gaps left at the 5' end of the lagging strand template. B) The activity of telomerase enzyme. C) DNA polymerase that cannot replicate the leading strand template to its 5' end. D) Gaps left at the 3' end of the lagging strand because of the need for a primer. Show Answer Correct Answer: A) They are gaps left at the 5' end of the lagging strand template. 6. DNA polymerase requires ..... to initiate replication. A) RNA primer. B) DNA polymerase I. C) Ligase. D) RNA polymerase. Show Answer Correct Answer: A) RNA primer. 7. The difference between DNA and RNA is that A) DNA has thymine and RNA has uracil. B) DNA has no oxygen bonded to the 2' carbon; RNA does. C) DNA is the genetic material; RNA is not. D) DNA is double stranded and RNA can't have hydrogen bond. Show Answer Correct Answer: B) DNA has no oxygen bonded to the 2' carbon; RNA does. 8. Which of the following statement is NOT true regarding transcription/RNA synthesis? A) RNA synthesis occurs in the nucleus. B) Unlike DNA synthesis, the only selective sequence of DNA is transcribed to RNA. C) RNA synthesis requires a short stretch of RNA primers. D) DNA sequences, specific proteins, and small RNAs regulate RNA synthesis. Show Answer Correct Answer: C) RNA synthesis requires a short stretch of RNA primers. 9. Introns code for proteins. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 10. Which of the following is true regarding the replication of prokaryotes and eukaryotes? A) Eukaryotic DNA elongates faster than prokaryotes. B) Eukaryotic DNA can initiate replication at multiple origins. C) Prokaryotic DNA is linear. D) Eukaryotic DNA has a single replication bubble. Show Answer Correct Answer: B) Eukaryotic DNA can initiate replication at multiple origins. 11. Which scientist first identified DNA as the genetic material? A) Alfred Hershey. B) Friedrich Meischer. C) Frederick Griffith. D) Gregor Mendel. Show Answer Correct Answer: B) Friedrich Meischer. 12. Which of the following acts as substrate as well as provide energy for DNA polymerisation? A) Ribonucleoside. B) Deoxyribonucleoside. C) Ribonucleotide. D) Deoxyribonucleoside triphosphate. Show Answer Correct Answer: D) Deoxyribonucleoside triphosphate. 13. Which enzyme is responsible for adding nucleotides? A) Topoisomerase. B) DNA Polymerase. C) Ligase. D) PrimaseTagsDNA replication enzymes. Show Answer Correct Answer: B) DNA Polymerase. 14. A DNA molecule in which both strands haveradioactive thymidine is allowed to duplicate inan environment containing non-radioactivethymidine. What will be the exact number of DNAmolecules that contains the radio active thymidineafter 3 duplications- A) 1. B) 2. C) 4. D) 8. Show Answer Correct Answer: B) 2. 15. Polymerase that synthesizes tRNA in eukaryotes A) RNA Pol I. B) RNA Pol II. C) RNA Pol III. D) DNA Pol I. Show Answer Correct Answer: C) RNA Pol III. 16. Which of the following is not a component of an operon? A) Operator. B) Promoter. C) Ribosome. D) Structural gene. Show Answer Correct Answer: C) Ribosome. 17. A across between two tall plants resulted in offspring having few dwarf plants. What would be the genotypes of both the parents? A) TT and Tt. B) Tt and Tt. C) TT and TT. D) Tt and tt. Show Answer Correct Answer: B) Tt and Tt. 18. Select the correct term to complete:The tails of histones help in DNA ..... A) Packaging. B) Replication. C) Transcription. D) Translation. Show Answer Correct Answer: A) Packaging. 19. The two nucleotides are linked by A) 3-5 phosphodiester bond. B) 5-3 phosphodiester bond. C) 3-5 hydrogen bond. D) 5-3 hydrogen bond. Show Answer Correct Answer: A) 3-5 phosphodiester bond. 20. In some viruses, DNA is synthesized by using RNA as a template. Such DNA is called: A) RDNA. B) A-DNA. C) B-DNA. D) CDNA. Show Answer Correct Answer: D) CDNA. 21. Which of the following is incorrect regarding repeated sequences A) It makes the large portion of the genome. B) It is directly involved in coding functions. C) It helps to study the chromosome structure. D) It helps to study the evolution. Show Answer Correct Answer: B) It is directly involved in coding functions. 22. At a specific area of a chromosome, the sequence of nucleotides below is present where the chain opens to form a replication fork:3' C C T A G G C T G C A A T C C 5'An RNA primer is formed starting at the red T of the template. Which of the following represents the primer sequence? A) 5' G C C T A G G 3'. B) 5' A C G U U A G G 3'. C) 5' A C G T T A G G 3'. D) 3' G C C T A G G 5'. Show Answer Correct Answer: B) 5' A C G U U A G G 3'. 23. Select the correct term to complete:Heterochromatin is ..... active. A) Transcriptionally active. B) Transcriptionally inactive. C) Translationally active. D) Replicationally active. Show Answer Correct Answer: B) Transcriptionally inactive. 24. Which of the following is incorrect regarding introns A) They do not appear in mature or processed RNA. B) They are intervening sequences. C) They are expressed in mature RNA. D) None of the above. Show Answer Correct Answer: C) They are expressed in mature RNA. 25. Which of the following is a genetic RNA? A) MRNA. B) RRNA. C) Hn-RNA. D) RNA present in plant viruses. Show Answer Correct Answer: D) RNA present in plant viruses. ← 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