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 psychrotroph
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Based on only the given information, which organism is likely most resistant to thermal sterilization?Org X, Z-value of 10.0 °COrg Y, Z-value of 2.0 °COrg Z, a mesophileOrg K, a psychrotroph
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- 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. psychrobotSpores and toxin-producing microorganism produce toxins need higher Aw than minimum Aw for microbial growth. How could food industry benefit from this fact?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 C
- The term psychrophile? a. refers to an organism that has an optimum growth within the range of -5 to 20oC b. refers to an organism that has an optimum growth at near neutral pHc. refers to an organism that has an optimum growth between 50 and 80oCA microbe that grows only at the bottom of a tube of thioglycollate medium is probably a(n) aerotolerant anaerobe. microaerophile. obligate aerobe. obligate anaerobe. facultative anaerobe.You inoculated two tubes of liquid cuture media with 100 bacterial cells and incubated one tube at 37C and the other at 55C. After 48 hours of incubation, you counted 20,000 bacteria per ml in the 55C tube and 1,000,000 bacteria per ml in the 37C tube. You can conclude that this species is a A) Thermophile B) Mesophile C) Halophile D) Psychrophile E) Psychrotroph
- Which of the following coud describe a microbe that causes a lemon left untouched in your refrigerator to spoil? Thermophile Obligate anaerobe none of these alkaliphile mesophileWhat 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) 2.0The generation time of a bacterium was measured at two different temperatures. Which results would be expected of a thermophile?a) 20 minutes at 10°C; 220 minutes at 37°Cb) 220 minutes at 10°C; 20 minutes at 37°Cc) no growth at 10°C; 20 minutes at 37°Cd) 20 minutes at 45°C; 220 minutes at 65°Ce) 220 minutes at 37°C; 20 minutes at 65°C
- how do microorganisms such as bacteria eliminate harmful reactive oxygen species? Nitrate reduction to nitrite is indicated by the formation of a pink to red colour after addition of nitrate test reagent. However, if a culture does not produce a colour change several posibilies exist. Explain.. What are the two major sources needed for microbial growth? (10) (i) …………………………… sources such as glucose, xylose, methanol, or lipids (ii) …………………………… sources such as urea, ammonium sulphate, ammonium nitrate and sodium nitrate.;A physician obtains a specimen from a patient with tuberculosis. This sample has one viable bacteria, an organism with slow doubling time in vitro of 48 hours, which corresponds to the growth rate constant in vitro of 0.04 h^-1. Estimating that the biomass of a single mycobacterial organism is 2.3x10^-13 g and that this organism is immediately going to enter the log phase, how many hours will it take to produce 10^-6 grams of biomass?