SECTION QUESTIONS Completion 1. Microbial cultures that contain only one type (o
ID: 201218 • Letter: S
Question
SECTION QUESTIONS Completion 1. Microbial cultures that contain only one type (one species or strain) of microorganisms are called 2. are usually the most resistant forms of life during sterilization. 3. Ionizing radiation kills microorganisms by producing and that reacts with and destroys important cell components such as proteins and nucleic acids. 4. is a gaseous chemical that is often used to sterilize heat-sensitive solid objects. True- False (correct all false statements) 1. Sterilization is the destruction or removal of pathogenic microorganisms. 2. The thermal death point is the lowest temperature at which all of the organisms in a liquid suspension will be killed within 10 minutes.._ 3. The physical parameters used in sterilization procedures are always designed specifically to kill the least resistant microbial form that is likely to occur in the object being sterilized 4. Most of the membrane filters that are commonly used for sterilization do not really sterilize the liquids that pass through them. Multiple Choice (circle all that apply) 1. Which of the following can be sterilized effectively in an autoclave? a. Typical microbiological growth media b. Empty glassware c. Plastic Petri dishes d. Dry powders 2. Which of the following methods is (are) suitable for sterilizing metal or glass surgical instruments? a. Chemical sterilization (EtO) b. Filtration c. Autoclaving d. Dry heat (hot-air oven)Explanation / Answer
1. Pure culture(contain only one type of known microbe).
2. Spores(they can survive extremes of heat, dryness, and even the presence of disinfectants and radiation).
3. damages DNA and produces peroxides.
4. Formaldehyde
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