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Question 4 Bacteria that utilize urea as a source of energy produce a by-product called A. Ammonia B. Acetoin C. Thioglycollate D. Nitrogen gas Question 5 Image below is for casein hydrolysis test: A. Test is positive for amylase production B. Test is negative for caseinase production C. Test is positive for urease production D. Test is positive for caseinase production Question 7 The reason why we incubate liquefied gelatinase test media on ice or in the refrigerator for 10 minutes or more is: A. To check if bacteria are psychrophilic B. To check if the liquefaction is because of gelatinase production C. To check if liquefaction is because of acid production D. A and B are answers Question 12 Arginine, ornithine and lysine decarboxylase tests are positive if and only if: A. Yellow color develops in all after overnight incubation B. Color of media remains purple in all after overnight incubation C. Pink color develops in all after overnight incubation D. Answer is not given

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