This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 24 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 24 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Splicing is one of the steps of post-transcriptional modifications which occurs in A) Nucleus. B) Cytoplasm. C) ER. D) Ribosomes. Show Answer Correct Answer: A) Nucleus. 2. Heterochromatin is A) Light-stained. B) Gene-rich. C) Compact. D) Active. Show Answer Correct Answer: C) Compact. 3. Information used by Watson and Crick to determine the structure of DNA included A) Electron micrographs of individual DNA molecules. B) Light micrographs of bacteriophage particles. C) Nuclear magnetic resonance analysis of DNA. D) X-ray crystallography of double-stranded DNA. Show Answer Correct Answer: D) X-ray crystallography of double-stranded DNA. 4. If a person suffered from a disorder where their DNA fragments were unable to fill in the missing slots in between the fragments of the lagging strand, they would most likely have a disorder that affected which enzyme? A) DNA Helicase. B) DNA Ligase. C) DNA polyermase. D) RNA PolymeraseTagsDNA replication enzymes. Show Answer Correct Answer: B) DNA Ligase. 5. In prokaryotes, the initiation factors (IF-1, IF-2, and IF-3) are involved in the initiation of protein synthesis. Which of the following factors facilitates the initiation codon? A) IF-1. B) IF-2. C) IF-3. D) All of the above. Show Answer Correct Answer: B) IF-2. 6. Which scientist experimentally proved that DNA is the sole genetic material in bacteriophage? A) Jacob and Monod. B) Beadle and Tautum. C) Messelson and Stahl. D) Hershey and Chase. Show Answer Correct Answer: D) Hershey and Chase. 7. What is meant by the description "antiparallel" regarding the two strands that make up the DNA double helix? A) The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand. B) One strand contains only purines and the other contains only pyrimidines. C) The double helix structure of DNA creates nonparallel strands. D) Base pairings create unequal spacing between the two DNA strands. Show Answer Correct Answer: A) The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand. 8. The removal of the RNA primer and addition of DNA nucleotides to the 3' end of Okazaki fragments in its place is carried out by ..... A) DNA polymerase I. B) Nuclease. C) Ligase. D) Primase. Show Answer Correct Answer: A) DNA polymerase I. 9. Primer A) An enzyme that catalyzes the synthesis of short RNA molecules called primers. B) A short nucleic acid sequence called a primer that provides a starting point for DNA synthesis. C) All the above. D) None of the above. Show Answer Correct Answer: B) A short nucleic acid sequence called a primer that provides a starting point for DNA synthesis. 10. The central dogma reverse flow occurs in A) Viruses. B) Algae. C) Bacteria. D) Animals. Show Answer Correct Answer: A) Viruses. 11. Heterochromatin A) Less compacted and more dispersed. B) Highly condensed and is visible as irregular clumps. C) All the above. D) None of the above. Show Answer Correct Answer: B) Highly condensed and is visible as irregular clumps. 12. The diameter of DNA helix is A) 10nm. B) 21A. C) 1nm. D) 2nm. Show Answer Correct Answer: D) 2nm. 13. What makes the exact copying of DNA molecules possible? A) Base pairing. B) Hydrogen bonding between nucleotides. C) Sugar-phosphate backbone. D) The double helix shape. Show Answer Correct Answer: A) Base pairing. 14. During DNA replication, Okazaki fragments are used to elongate: A) The lagging strand towards replication fork. B) The leading strand away from replication fork. C) The lagging strand away from the replication fork. D) The leading strand towards replication fork. Show Answer Correct Answer: C) The lagging strand away from the replication fork. 15. Name the plant used by Taylor & Co in their experiment A) Oryza sativa. B) Triticum vulgare. C) Vincia faba. D) None of the above. Show Answer Correct Answer: C) Vincia faba. 16. What scientist(s) used bacteriophages to show that DNA is what carries our genetic material? A) Chargraff. B) Hershey and Chase. C) Rosalind Franklin. D) Watson and Crick. Show Answer Correct Answer: B) Hershey and Chase. 17. The largest gene in humans is A) Titin. B) Dystrophin. C) Insulin. D) Phosphofructokinase. Show Answer Correct Answer: B) Dystrophin. 18. The force that holds DNA together in a double helix is A) The force of the twist. B) Covalent bonds. C) Ionic bonds or ionic interactions. D) Hydrogen bonds. Show Answer Correct Answer: D) Hydrogen bonds. 19. Enzymes called ..... add complementary nucleotides, floating inside the nucleus. A) DNA polymerase. B) DNA synthetase. C) Lipoprotein. D) None of these. Show Answer Correct Answer: A) DNA polymerase. 20. If an organism's DNA contains 22% Thymine, what percentage Cytosine will it have? A) 22%. B) 25%. C) 28%. D) 78%. Show Answer Correct Answer: C) 28%. 21. Bacteriophages A) Protozoa that infect and replicate within bacteria. B) Viruses that infect and replicate within bacteria. C) Fungi that infect and replicate within bacteria. D) Bacteria that infect and replicate within viruses. Show Answer Correct Answer: B) Viruses that infect and replicate within bacteria. 22. Who first identified the biochemical nature of gene? A) Freiderich Griffith. B) Hershy and Chase. C) Averoy and Mac Leod. D) Measelson and Stahl. Show Answer Correct Answer: C) Averoy and Mac Leod. 23. Generally only one strand of DNA is transcribed. This strand is called A) "A" strand. B) "B" strand. C) Sense strand. D) Template strand. Show Answer Correct Answer: D) Template strand. 24. Read the following statementsStatement I:5-methyl uracil is present in RNA molecule.Statement II:The packaging of chromatin at higher level requires additional set of proteins that collectively are referred to as histone proteins. A) Only statement I is correct. B) Only statement II is correct. C) Both statements are correct. D) Both statements are incorrect. Show Answer Correct Answer: D) Both statements are incorrect. 25. Lactose Operon is a set of lactose metabolizing gene that is co-coordinately expressed and regulated. The following is not the gene of lactose operon: A) LacX. B) LacZ. C) LacY. D) LacA. Show Answer Correct Answer: A) LacX. ← 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