In the Durham tube fermentation test each a. with beef extracts or peptone b. wi
ID: 86250 • Letter: I
Question
In the Durham tube fermentation test each a. with beef extracts or peptone b. with citrate as sole source of carbon c. a specified d. a and e The pH indicator phenol red a. green at acidic value b. red at acidic value c. yellow at acidic value d. black at acidic value If an organism ferment a sugar a. acid is usually produced b base is usually produced c. gas may also be end product d. a or a and e occur e. (b) and (c) occur E coli is a. a glucose fermenter b a gram negative bacterium c. a rod shaped bacterium d all of the above e. none of the above Methyl Red test is an important test in differentiating genera such as a. Escherichia, and Salmonella b. protease and Aeromonads c. mumps virus and prohormones d. a and b. e. a and c In the O/F glucose test, if an organism can metabolized glucose aerobically and anaerobically, this organism is said to be a. fermentative and oxidative in its metabolism b fermentative in its metabolism c, oxidative in its metabolism d none of the above Which of the following microorganisms will be positive for the citrate test? a. Enterobacter aero gents b. E coll c. Pseudomonas aeruginosa d. none of the above Cytochrome oxidase occurs in a. bacteria that carry out fermentation b. bacteria that carry out oxidation c. Pseudomonas d. a and be. b and c Hydrogen peroxide is a highly reactive oxidizing agent that can damage essential molecules in the bacterial cell. To avoid this damage, aerobes produce the enzyme a. catalase b deaminase e. lipase d. caseins The enzyme nitrate reductase catalyzes a. the transfer of electron from cytochrome b to nitrate, reducing it to nitrite b. the transfer of electron from nitrate to cytochrome c the transfer of electron from cytochrome b to nitrite reducing it to nitrate d. none of the above transfersExplanation / Answer
Answer for Question number 30 : The correct option is A (Catalase)
Explanation : Catalase is the enzyme that uses the hydrogen peroxide produced and breaks down hydrogen peroxide into water and oxygen and protects the cell from oxidising effects of hydrogen peroxide.