Lac OperonRBRJuly 16, 2022 Welcome to Lac Operon Name Email 1. How many structural genes are present in lac operon? 1 2 3 4 None 2. Lac operon plays important role in the metabolism of ---------? Glucose Lactose Fructose Galactose None 3. What is the role of lac Z gene ? Tansportation of lactose Breakdown of lactose into glucose and galactose permeation of lactose inside cells none of the above None 4. Lac operon model first explained by ____________ ? Charles Darwin Jacob and Monad Louis Pasture Robert Hook None 5. Which regulator protein turn the lac operon "ON" in presence of lactose level ? Add description here! Catabolite Activator Protein (CAP) Lac Repressor protein RAN polymerase DNA polymerase None 6. Which regulator protein turn the lac operon "OFF" in presence of increased glucose level? lac repressor protein Catabolite Activator Protein DNA polymerase RNA Polymerase None 7. Which regulator protein acts as glucose sensor? Lac repressor DNA polymerase RNA polymerase Catabolite Activator Protein (CAP Protein) None 8. Lac operon is expressed only when there is ......................... ? both lactose and glucose present lactose absent and glucose present lactose present and glucose absent both lactose and glucose absent None 9. Which two regulator proteins turn the lac operon "ON" and "OFF" in response to lactose and glucose levels? DNA polymerase and RNA polymerase lac repressor and Catabolite Activator Protein cAMP and ATP None of the above None 10. Which regulator protein acts as lactose sensor? ATP Lac repressor RNA Polymerase Catabolite Activator Protein (CAP) None 11. When E. Coli is grown in presence of lactose and glucose, which one is first utilized by E.coli lactose glucose and lactose simultaneously glucose None of the above None 12. Allolactose is an isomer of lactose, when Allolactose binds to repressor the repressor protein becomes _________________ ? Active and remains bound to operator Inactive and displaces and fall from promoter allolactose doesnt bind to repressor protein None of the above None 13. When glucose levels increases in cell then levels of cAMP Decreases increases levels remains unchanged None of the above None 14. When glucose levels decrease in cell then levels of cAMP _____________________ ? increases decreases remains unchanged none of the above None 15. None Please fill in the comment box below. Time's up
