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What are osmophilic (or halophilic) organisms




can you please help me with this question.;1) What are osmophilic (or halophilic) organisms;a) Microorganisms that require low pH for growth.;b) Microorganisms that can?t perform osmosis.;c) Microorganisms that require the presence of a low solute concentration.;d) Microorganisms that are able to grow in the presence of a high solute concentration.;2) What is the mechanism behind the action of UV light on microorganisms?;a) It promotes chemical and physical changes in nucleic acids and proteins.;b) It stops bacterial endospore formation.;C) It causes dehydration of the cell;D) It causes osmotic lysis;3) What is the activity of plain soap to prevent transmission of infectious disease?;A) Soap is positively charged and acts to disrupt membranes of bacteria.;B) Soap creates reactive oxygen species to disrupt cellular functions;C) Soap binds to nucleic acids to create thymine dimers;D) Soap acts as a degerming agent to remove oil and surface microbes;4) Often the number of bacteria isolated off of hands after hand washing actually INCREASES with more washes. Why?;A) Because washing stimulates rapid bacterial growth.;B) Because hand washing doesn?t work to remove bacteria.;C) Because the soap or hand sanitizer is contaminated.;D) Because you begin to remove resident flora after several washes;5) Which organism is the most resistant to the lethal effects of ultraviolet light?;A) A protozoan that does not form cysts;B) A spore-forming bacteria;C) A virus;D) A gram negative bacteria;6) Since 70% alcohol acts to denature proteins, but this action takes time. What are we really accomplishing by swabbing a patient prior to hypodermic needle injection?;A) Killing of all surface bacteria;B) Cleaning the area and removal of some surface bacteria.;C) Contamination of the injection site with pathogens;D) Complete sterilization of the injection site


Paper#17603 | Written in 18-Jul-2015

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