Upgrade to remove ads
Only $35.99/year

Microbiology Chapter 9

Terms in this set (22)

Triclosan destroys bacteria by
disrupting cell membranes.
Of the following, the most efficient method for sterilization of a bacteriological loop is
the direct flame
_______ involves reducing the numbers of pathogenic microbes to a level considered safe by public health standards.
Sanitization
A substance that has been pasteurizedis not necessarily sterile.
is not necessarily sterile
Iodophors are
complexes of iodine and detergents that release iodine over long periods of time
When applied to wounded tissue, hydrogen peroxide
releases oxygen gas
Which one of the following is the most rapid method for achieving sterilization?
Direct flame method
Ethyl alcohol has virtually no effect on
bacterial sopres
The time necessary to kill a population of microbes at a given temperature is called the
thermal death time
The principle effect of ultraviolet light on bacterial cells takes place
in the DNA of the cell
Silver nitrate was used to
prevent gonorrhea in the eyes of newborns
A period of two hours at 160°C is required for the destruction of bacterial spores
in the hot-air oven
One of the limitations of the autoclave is that
some plasticware melts in the high heat
Which one of the following elements would be classified as a halogen?
chlorine
Low temperature (like that found in a refrigerator) is
bacteriostatic
Which chemical would be a sterilization method for plasticware that cannot be heated?
Ethylene oxide gas
when food had been salted
water diffuses out of microorganisms causing them to shrivel
Filtration is very different from heat or radiation methods because
it is a physical separation method rather than a sterilization method
A phenol coefficient (PC) higher than 1 indicates a chemical is
more effective than phenol
Detergents display their antimicrobial ability by
altering the cell membrane and causing cell lysis
How are antiseptics and disinfectants different?
Disinfectants are used on objects, whereas antiseptics are used on living tissues
_______ is a condition in which microbes or their toxins are present in tissues or the blood.
sepsis
Students also viewed