Question: 9. What Causes A Slant To Turn Red Or Alkaline? 10. What Two Things Could It Mean If The TSI Slant And Butt Exhibits No Color Change? 11. List Two (2) Gram Negative Bacilli Which Are Lactose Positive (ferment Lactose). List Two (2) Which Are Inctose Negative. 12. List The Tests In The IMVAC Reactions And Briefly Explain The Principles Of Each 13. Why …

9. What causes a slant to turn red or alkaline? 10. What two things could it mean if the TSI slant and butt exhibits no color change? 11. List two (2) gram negative bacilli which are lactose positive (ferment lactose). List two (2) which are Inctose negative. 12. List the tests in the IMVAC reactions and briefly explain the principles of each 13. Why must there be a clear red color in the methyl red tube instead of orange or yellow to be called positive? 14. Explain why organisms which are methyl-red positive are usually Vogen-Pronkmer negative. 15. When inoculating motility media, why is it necessary to stab straight in and then straight out? 16. Why must the control tube in the decarboxylase test be yellow in order for the results to be accurate? 17. In your own words, explain why zinc dust must be added to cach negative nitrate reduction test. 18. Which are the only Enterobacteriaceae that are phenylalanine deaminase positive?