This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 10 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Mode of DNA replication in E. coli is:- A) Conservative and unidirectional. B) Semi conservative and unidirectional. C) Conservative and bidirectional. D) Semi conservative and bidrectional. Show Answer Correct Answer: D) Semi conservative and bidrectional. 2. Polymerase is able to replicate the new DNA ..... along the leading strand. A) Continuously. B) Only in short fragments. C) Very slowly. D) Prokaryotically. Show Answer Correct Answer: A) Continuously. 3. DNA replication begins at A) Ribosomes. B) Ori-site. C) Terminal regions. D) Promoter. Show Answer Correct Answer: B) Ori-site. 4. Which enzyme is responsible for maintaining telomeres? A) Hexokinase. B) Telomerase. C) Topoisomerase. D) Helicase. Show Answer Correct Answer: B) Telomerase. 5. Okazaki fragments appear on which strand of DNA during DNA replication? A) Lagging. B) LeadingTagsreplication fork. C) All the above. D) None of the above. Show Answer Correct Answer: A) Lagging. 6. If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is A) Autosomal dominant. B) Autosomal recessive. C) Sex-linked dominant. D) Sex-linked recessive. Show Answer Correct Answer: D) Sex-linked recessive. 7. DNA replication needs A) RNA primer. B) DNA template. C) DNTPs. D) All are correct. Show Answer Correct Answer: D) All are correct. 8. The net electric charge on DNA and histones is A) Both positive. B) Both negative. C) Negative and positive, respectively. D) Zero. Show Answer Correct Answer: C) Negative and positive, respectively. 9. Which of the following is NOT a component of the lac operon structural genes? A) $\beta$-galactosidase gene (z). B) Permease gene (y). C) Transacetylase gene (a). D) Repressor gene (i). Show Answer Correct Answer: D) Repressor gene (i). 10. Which of the following is not the positive regulator of Lac operon A) Allolactose. B) Glucose. C) Lactose. D) CAMP. Show Answer Correct Answer: B) Glucose. 11. The process of copying genetic information from one strand of DNA to RNA is termed as ..... A) Replication. B) Transcription. C) Translation. D) Reverse transcription. Show Answer Correct Answer: B) Transcription. 12. Assertion:The two strands of DNA are antiparallel Reason:Only antiparallel polynucleotides form a stable double helix. 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. 13. Griffith performed an experiment to prove the chemical nature of genetic material. In Griffith's experiment: A) The protein coat from pathogenic cells was able to transform non-pathogenic cells. B) Heat killed pathogenic cells caused pneumonia. C) Some substance from pathogenic cells was transferred to non-pathogenic cells and causes transformation. D) The polysaccharide coat of bacteria caused Pneumonia. Show Answer Correct Answer: C) Some substance from pathogenic cells was transferred to non-pathogenic cells and causes transformation. 14. Who is credited with explaining the structure of the DNA double helix? A) Watson and Crick. B) Avery, McCarty, and MacLeod. C) Rosalind Franklin. D) Hershey and Chase. Show Answer Correct Answer: A) Watson and Crick. 15. Which of the following is true about histones? A) Histones are basic proteins. B) Histones are acidic proteins. C) Histones are-vely charged. D) None of the above. Show Answer Correct Answer: A) Histones are basic proteins. 16. How many strands of nucleotides does a molecule of RNA contain? A) One. B) Two. C) Three. D) Four. Show Answer Correct Answer: A) One. 17. DNA polymerase has no proofreading activity. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 18. Lactose from the external medium is transported inside the bacterial cell with the help of A) Transacetylase. B) Permease. C) Beta-galactosidase. D) Transferases. Show Answer Correct Answer: B) Permease. 19. What event is indicative of transcription initiation? A) RNA polymerase is removed from the DNA. B) RNA polymerase binds to the promoter. C) The RNA strand begins to be synthesized. D) Telomerase lengthens the telomeres of the DNA. Show Answer Correct Answer: B) RNA polymerase binds to the promoter. 20. The process of converting mRNA to protein is A) Transcription. B) Replication. C) Translation. D) Splicing. Show Answer Correct Answer: C) Translation. 21. Which of the following is a complete assembled prokaryotic Ribosome? A) 16S rRNA. B) 23S rRNA. C) 70S RNA. D) 50S rRNA. Show Answer Correct Answer: C) 70S RNA. 22. Hydrogen bonds occur between which of the following constituents of DNA? A) Sugar and base. B) Phosphate and base. C) Complementary bases. D) Phosphate and sugar. Show Answer Correct Answer: C) Complementary bases. 23. Amino acids which are specified by single codons are A) Phenylalanine and arginine. B) Tryptophan and methionine. C) Valine and proline. D) Methionine and arginine. Show Answer Correct Answer: B) Tryptophan and methionine. 24. The RNA polymerase holoenzyme transcribes: A) The structural gene only. B) The structural gene and the terminator region. C) The promoter and the terminator region. D) The promoter, structural gene and the terminator region. Show Answer Correct Answer: C) The promoter and the terminator region. 25. Which of the following RNA molecules serves as an adaptor molecule during proteins synthesis A) RRNA. B) MRNA. C) TRNA. D) TRNA and mRNA. Show Answer Correct Answer: C) TRNA. ← 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 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books