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Which of P. aeruginosa or B. subtilis do you think will be able to survive boiling for the longest time? Justify your answer.
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- What is a generally minimum pH for growth and toxin production by Clostridium botulinum and other foodborne pathogens?a) 8.5 b) 7.0 c) 6.5 d) 4.5 e) 2.0Bacillus megaterium has a high thermal death point and a long thermal death time, but it is not classified as a thermophile. Explain.Salmonella typhi is a facultative anaerobe. Explain why.
- What are the components of a carbon-free broth or minimum medium for Bacillus subtillus ? An example for broth without carbon to use for B.subtillus.What is the proper term for an organism whose optimum growth range is between 20 and 50C but can grow well at refrigerator temperatures? a. psychrophile b. psychrotroph c. hypophiles d. psychrobotFor which diseases can one not rely upon chlorination of water as a method of control? Explain why this is true
- Based on only the given information, which organism is likely most resistant to thermal sterilization? Org X, Z-value of 10.0 °C Org Y, Z-value of 2.0 °C Org Z, a mesophile Org K, a psychrotrophWhich of the following is an organism involved in nitrification? Nitrosomonas Clostridium Azotobacter PseudomonasSuperoxide ion is toxic to strict anaerobes because they lacka. catalase b. peroxidase c. dismutase d. oxidase
- give one reason why is it necessary to keep stirring the agar medium mixture in a beaker when heating in a hotplate?The following plates were inoculated with organisms A, B, C, and D on each sector of this plate. Each plate was grown at the the temperature indicated (4C, 25C, 40C, and 60C). Choose the organism that is the psychrophile. A B D CWhich antimicrobics would be suitable for the control of the following organisms?S. aureus:E. coli:P. vulgaris:P. aeruginosa: