This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 6 Molecular Basis Of Inheritance – Quiz 44 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 6 Molecular Basis Of Inheritance Quiz 44 (17 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Scientists at a university are examining a molecule that contains sugar, phosphate, adenine, and uracil. Which of the following molecules is being examined? A) RNA. B) DNA. C) Protein. D) Enzyme. Show Answer Correct Answer: A) RNA. 2. Bacteriophage $\lambda$ has A) 485000 bp. B) 48502 bp. C) 485020 bp. D) 4850002 bp. Show Answer Correct Answer: B) 48502 bp. 3. DNA has the following bases:GGT AGG CCAWhat mRNA would be created from this strand? A) CCA UCC GGU. B) CCA TCC CCT. C) GGU UCC CCA. D) CCT TCC CCA. Show Answer Correct Answer: A) CCA UCC GGU. 4. Ribosomes move along mRNA during translation. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. How far is each base pair from the next one in the DNA double helix model? A) 34 nm. B) 2 nm. C) 3.4 nm. D) 0.34 nm. Show Answer Correct Answer: D) 0.34 nm. 6. Which of the following is the FALSE statement of the Lactose operon A) Lac Operon is activated when glucose is absent. B) Lac Operon is activated when lactose is present. C) Lac Operon is activated when glucose is absent and lactose is present. D) Lac Operon is activated when glucose is present and lactose is absent. Show Answer Correct Answer: D) Lac Operon is activated when glucose is present and lactose is absent. 7. The steps of the ladder are A) Individual nitrogenous bases. B) Pairs of bases. C) Alternating bases and phosphate groups. D) Alternating sugars and bases. Show Answer Correct Answer: B) Pairs of bases. 8. One of the following is true with respect to AUG A) It codes for methionine only. B) It is also an initiation codon. C) It codes for methionine in both prokaryotes and eukaryotes. D) All of the above. Show Answer Correct Answer: D) All of the above. 9. Which of the following statements correctly describes the structure of chromatin? A) Both heterochromatin and euchromatin are found in the cytoplasm. B) Heterochromatin is highly condensed, whereas euchromatin is less compact. C) Euchromatin is not transcribed, whereas heterochromatin is transcribed. D) Heterochromatin is composed of DNA, whereas euchromatin is made of DNA and RNA. Show Answer Correct Answer: B) Heterochromatin is highly condensed, whereas euchromatin is less compact. 10. Which is not part of a DNA nucleotide? A) Phosphate group. B) Ribose. C) Nitrogen base. D) Deoxyribose. Show Answer Correct Answer: B) Ribose. 11. LacZ encodes for a protein A) Transacetylase. B) Beta-galactosidase. C) Repressor protein. D) Permease. Show Answer Correct Answer: B) Beta-galactosidase. 12. Which enzyme removes RNA primers? A) DNA Polymerase I. B) Ligase. C) Helicase. D) Primase. Show Answer Correct Answer: A) DNA Polymerase I. 13. The significance of Chargaff's rules in understanding the structure of DNA is: A) They describe the base pairing rules. B) They determine the sequence of nucleotides. C) All the above. D) None of the above. Show Answer Correct Answer: A) They describe the base pairing rules. 14. Satellite DNA is classified based on A) Their base composition. B) Length of segment. C) Number of repetitive units. D) All of the above. Show Answer Correct Answer: D) All of the above. 15. Chemically DNA differs from RNA as- A) Uracil is present instead of thymine. B) Deoxyribose & thymine present in DNA and ribose and uracil in RNA. C) Ribose & uracil present in place of deoxyribose and thymine. D) Deosyribose & uracil is present in place of ribose & thymine. Show Answer Correct Answer: B) Deoxyribose & thymine present in DNA and ribose and uracil in RNA. 16. In semiconservative replication of DNA A) The original double helix remains intact and a new double helix forms. B) The strands of the double helix separate and act as templates for new strands. C) Polymerization is catalyezed by RNA polymerase. D) Polymerization is catalysed by a double helical enzyme. Show Answer Correct Answer: B) The strands of the double helix separate and act as templates for new strands. 17. The electrophoretic separation of the pieces of DNA in each of the four samples was achieved because of differential migration of the DNA fragments in an electric field. This differential migration was caused by the A) Size of each fragment. B) Relative amounts of radioactivity in the DNA. C) Number of cleavage points per fragment. D) Overall positive charge of each fragment. Show Answer Correct Answer: A) Size of each fragment. ← PreviousRelated 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