Micro 3003 Ray midterm exam I version A nane March 1, 2018 B. 64,000 C. 100,000.

Question

Micro 3003 Ray midterm exam I version A nane March 1, 2018 B. 64,000 C. 100,000." D. 320,000 16. The optimal temperature for most human pathogens might be expecied to range from optimal temperature for most buman pathogens might be expected to range from A. 35-40C. B. 20°-45 c C. 15°-25°C D. 93-98.6"C. 17. Organisms may derive energy from A. sunlight. B. metabolizing chemical compounds. C C. little tiny AAAAAAAAA batteries. D. temperature gradients. E. sunlight AND metabolizing chemical compounds. Chapter 5: Control of Microbial Growth 18. Plain soap is effective in controlling spread of microorganisms bocause it is A. bacteriostatic B. very effective at the mechanical removal of microorganisms. C. virucidal D. bactericidal. 19. The process of killing or removing all of the microorganisms in or on a material is termed A. sterilization B. disinfection. C. sanitation D. antisepsis. 20. Which of the following organisms are resistant to destruction by typical disinfection methods? A. Endospores of Bacilus and Clostridion spp. B. Pseudomonas spp. C. Non-enveloped viruses D. Mycobacterium spp. E. All of the choices are correct. 21 Ifa process kills 90% of the organisms per minute, how many minutes would it take to kill all organisms when starting with 10 organisms? A. 3 minutes B. 6 minutes C. 8 minutes D.10 minutes E. I hour 22. Liquid media containing heat-sensitive components would best be sterilized by D A. ultraviolet (UV) light at 500 nm. B. freezing. C. lyophilization. D. membrane filtration.

Explanation / Answer

16. A. 35-40° C

17. E. Sunlight AND metabolizing chemical compounds

18. B. very effective at the mechanical removal of microorganism

19. A. Sterilization

20. E. all of the choices are correct

22. D. membrane filtration

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