This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 40 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 40 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If there are 999bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that length of the RNA becomes 998, how many codons will be altered? A) 11. B) 33. C) 333. D) 1. Show Answer Correct Answer: B) 33. 2. It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information. Which of the following characteristics of DNA is responsible for this? A) Phosphate-sugar backbones. B) Complementary pairing of bases. C) Sequence of bases. D) Side groups of nitrogenous bases. Show Answer Correct Answer: C) Sequence of bases. 3. In a mutation event, when adenine is replaced by guanine, it is a case of A) Frame shift mutation. B) Transcription. C) Transition. D) Transversion. Show Answer Correct Answer: C) Transition. 4. Select the incorreclty matched pair. A) Initation codons-AUG, GUG. B) Stop codons-UAA, UAG, UGA. C) Methionine-AUG. D) Anticodons-mRNA. Show Answer Correct Answer: D) Anticodons-mRNA. 5. A small circular piece of DNA found in bacteria are called ..... A) Recombinants. B) Vectors. C) Plasmids. D) Prokaryotes. Show Answer Correct Answer: C) Plasmids. 6. Which strand is synthesized continuously during DNA Replication A) Leading Strand. B) Lagging Strand. C) All the above. D) None of the above. Show Answer Correct Answer: A) Leading Strand. 7. The lac operon genes only become expressed if: A) Lactose binds to the repressor. B) Glucose binds to the repressor. C) Lactose binds to the operator. D) The repressor binds to the operator. Show Answer Correct Answer: A) Lactose binds to the repressor. 8. Which of the following is not involved in the initiation of replication? A) Ligase. B) DNA gyrase. C) Single-stranded binding protein. D) PrimaseTagsDNA replication enzymes. Show Answer Correct Answer: A) Ligase. 9. In Prokaryotes, gene reguoccurs at the level of A) Transcription. B) Translation. C) Post-transcription. D) Post-translation. Show Answer Correct Answer: A) Transcription. 10. Chemically, RNA is (i) reactive and (ii) stable as compared to DNA. A) (i) equally, (ii) equally. B) (i) less, (ii) more. C) (i) more, (ii) less. D) (i) more, (ii) equally. Show Answer Correct Answer: C) (i) more, (ii) less. 11. Assertion:Enzymes required for DNA replication are efficient enzymes Reason:They can polymerise large number of nucleotides in very short time A) Both assertion and reason are true and the reason is the correct explanation of assertion. B) Both assertion and reason are true but the reason is not the correct explanation of assertion. C) Assertion is true but reason is false. D) Both assertion and reason are false. Show Answer Correct Answer: A) Both assertion and reason are true and the reason is the correct explanation of assertion. 12. 5'-3' end of DNA strand is called A) Sense strand. B) Coding strand. C) Non-template strand. D) All of the above. Show Answer Correct Answer: D) All of the above. 13. The significant aspect of reverse transcription is A) The flow information from DNA to RNA. B) The flow information from RNA to DNA. C) The flow information from RNA to proteins. D) Both a and c. Show Answer Correct Answer: B) The flow information from RNA to DNA. 14. They year 2003 was celebrated as the 50th anniversary of discovery of A) Transposons by Barbare Me Clintock. B) Structure of DNA by Watson and Crick. C) Mendel's laws of inheritance. D) Biotechnology by Kary Muliis. Show Answer Correct Answer: B) Structure of DNA by Watson and Crick. 15. Lac operon is switched on in the presence of A) Glucose. B) Lactose. C) Fructose. D) Galactose. Show Answer Correct Answer: B) Lactose. 16. A base sequence is shown:ACAGTGC How would the base sequence be coded on mRNA? A) TGTCACG. B) GUGACAU. C) UGUCACG. D) CACUGUA. Show Answer Correct Answer: C) UGUCACG. 17. Which is the Codon containing A) T rna. B) M rna. C) R rna. D) Hn rna. Show Answer Correct Answer: B) M rna. 18. DNA finger printing is a technique in molecular biology. Arrange the following steps in sequence. 1) Blotting of DNA fragment to nitro cellulose. 2) Digestion of DNA by restriction endonuclease. 3) Detection of DNA by autoradiography. 4)Isolation of DNA, 5) separation of DNA fragments by electrophoresis A) 4 2 1 5 3. B) 4 2 5 1 3. C) 2 4 1 5 2. D) 4 3 5 1 2. Show Answer Correct Answer: B) 4 2 5 1 3. 19. Each set of three nitrogen bases that represents an amino acid is ..... A) A code. B) An enzyme. C) A helix. D) A codon. Show Answer Correct Answer: D) A codon. 20. DNA replication takes place at ..... phase of the cell cycle. A) S. B) M. C) G2. D) G1. Show Answer Correct Answer: A) S. 21. Both deoxyribose and ribose belong to a class of sugars called: A) Trioses. B) Hexoses. C) Pentoses. D) Polysaccharides. Show Answer Correct Answer: C) Pentoses. 22. Polysomes are A) Aggregation of ribosomes. B) Aggregation of lysosomes. C) MRNA molecules to which many ribosomes are attached simultaneously. D) All of these. Show Answer Correct Answer: C) MRNA molecules to which many ribosomes are attached simultaneously. 23. The DNA strand that codes for protein is known as the ..... A) Exons. B) Introns. C) Control regions. D) Intervening sequences. Show Answer Correct Answer: A) Exons. 24. In transcription in eukaryotes, heterogenous nuclear RNA (hnRNA) is tmascribed by A) RNA polymerase I. B) RNA polymerase II. C) RNA polymerase III. D) All of these. Show Answer Correct Answer: B) RNA polymerase II. 25. One gene-one enzyme hypothesis was proposed by A) Watson. B) Beadle and Tatum. C) Chargaff. D) Meselson. Show Answer Correct Answer: B) Beadle and Tatum. ← 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