20- Which tube is positive for the Presence of nitrite? the RED tube. 18- The oxidase test indicates the presence of which enzyme? CYTOCHROME C OXIDASE 19- The nitrate reduction test indicates that presence of which enzyme? NITRATE REDUCTASE. 17- Which spot shows a negative catalase test? A negative result shows no bubbles. 16- What is the subtrate in the catalase test: H2O2, Hydrogen Peroxide. 14- Which tube(s) demonstrate (s) acid prodcution? YELLOW TUBES 15- Name 2 products of the catalase reaction: Oxygen and Water. 12- In the carbohydrate fermentation test, what is the name of the pH indicator? PHENOL RED 13- What is purpose of the Durham tubes? indicate the gas production. 11- Why is the top region of some of tubes is PINK? Fresh media will appear clear to straw-colored with a pink region at the top where the dye has become oxidized. 10- Which tube represent a growth pattern of strict aerobe? 4, growth on the TOP only. 8- What gas is removed from Fluid Thioglycollate medium during autoclaving? OXYGEN 9- Which tube represents a growth pattern of a strict anaerobe? 3, growth on the BOTTOM only. Is a defined or undefined medium? UNDEFINED. (UFT) 7- Fluid thioglycollate medium is good for growing wide range of fastidious bacteria. 5- What is the term for the growth pattern in the top tube? FLOCCULENCE 6- What is the term for the growth pattern in these tubes? UNIFORM FINE TURBIDITY. 3- Grow dense and opaque with smooth edges on a slant is termed: FILFORM 4- List 1 of the primary uses for agar slants: CULTIVATIONS, STORE the stock cultures. TRUE 2- A single bacterial cell exponentially divides until eventually a visible mass of cells called a COLONY appears. 1- True/False Microbial growth are determined by the genetic makeup but are greatly infulenced by environmental factors.
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