Read all questions CAREFULLY and remember spelling counts GOOD LUCK Multiple Cho

Question

Read all questions CAREFULLY and remember spelling counts GOOD LUCK Multiple Choice: (2 points each) 1. Which of the following extremophiles is NOT matched with its proper environment? a. Psychrophiles-cold temperatures b. Barophiles -high pressure c. Alkalinophiles- basic conditions d. Halophiles- low salt concentrations 2. Which of the following microbes are considered to be the most resistant to methods used for microbial control? a. Fungal spores b. Viruses c. Bacterial endospores d. Protozoan trophozoites 3. is a process used to destroy vegetative pathogens, but not endospores, on inanimate objects. a. Disinfection b. Sterilization c. Degermation d. Sanitization Consider microbial control, which of the following factors does not influence the death rate of undesirable microorganisms? 4. The presence of water The mode of action of the agent used The presence of organic matter The pH of the environment a. b. c. d. 5. Surfactants are molecules that affect of some microorganisms. a. The cell wall b. Protein synthesis c. The cell membrane d. DNA replication 6. Which of the following is NOT used as a physical method for microbial control? a. dessication b. heat c. gases d. radiation

Explanation / Answer

Ans1) Option 4.Halophiles- low salt concentration.

explain- Halophiles are organism that grow in high salt concentration.

Ans 3) a. Disinfectant

Ans 5) A. The cell wall

Ans 6) C. Gases.

Gases are not used as a physical method for microbial control

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