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49 terms

Micro Final Fall 2012 Part 2 of 5

uber moronic.
STUDY
PLAY
An agent used to reduce the number of bacteria on a toilet would most accurately be called:
disinfectant
Most bacteria reproduce by
binary fission
During which growth phase will gram-positive bacteria be most susceptible to penicillin?
log phase
In a test tube filled with liquid, where to microaerophiles hang out?
in the middle; they require (love) a little bit of oxygen
In a test tube filled with liquid, where do the facultative anaerobes hang out?
mostly toward the surface, but they are spread throughout; they do not required oxygen, but they can live in its presence
In a test tube filled with liquid, where do the obligate aerobes hang out?
at the surface; they require oxygen
In a test tube filled with liquid, where do the obligate anaerobes hang out?
at the bottom; they cannot tolerate oxygen
Which agent is commonly used for chemical sterilization?
ethylene oxide
What is the process of the skin being swabbed with alcohol before receiving an injection?
degerming
What is the destruction of vegetative pathogens on living tissue?
antisepsis
What is treatment intended to lower microbial counts on eating and drinking utensils to safe public health levels?
sanitization
What is removal or destruction of all living organisms, including endospores (except prions)
sterilization
T/F: Bacterial growth refers to an increase in the number of cells in a bacterial culture
True
T/F: Filtration methods are used to count bacteria in very low concentration, such as in lakes or streams
True
T/F: Most pathogenic bacteria are thermophiles
False
What is the name of the agent commonly used as a chemical food preservative?
Benzoic acid
In what way are semisynthetic penicillins and natural penicillins alike?
Both are based on Beta-lactam
What is an inhibitor of essential metabolite synthesis?
Trimethoprim
What is an inhibitor of cell wall synthesis?
Penicillin
What is an inhibitor of nucleic acid replication?
Quinolones
What is an inhibitor of protein synthesis?
Tetracycline
What drug works to injure the plasma membrane?
Polymyxin B
The major significance of Robert Koch's work is that
microorganisms can cause disease
One effect of washing regularly with antibacterial agents is the removal of normal microbiota. This can result in:
increased susceptibility to disease
A needlestick is an example of
a formite
The science that deals with when diseases occur and how they are transmitted is called:
epidemiology
Symptoms of disease differ from signs of disease in that symptoms are:
changes felt by the patient/subjective
If a prodromal period exists for a certain disease, it should occur prior to:
illness
T/F: Reservoirs of infections are always animate objects
False
T/F: Both normal and transient flora can become opportunistic pathogens
True
T/F: A syndrome is a specific group of diagnoses that always accompanies a specific disease
False
T/F: Compromised hosts are always suffering from suppressed immune systems
False
What is used to preserve meat products such as ham, bacon, hotdogs, and sausage
Nitrates/Nitrites
What is widely used to control mold and some bacteria in foods and cosmetics?
Sorbic Acid
What is used for skin degerming and removal of debris?
Soaps
What is a bisphenol used in disinfectant hand soaps and skin lotions?
Triclosan
More than half of our antibiotics are produced by:
bacteria
To date, most of our natural antibiotics have been found to be produced by members of what genus?
Streptomyces
What does this statement refer to: Some bacterial mutants modify the porin opening so that antibiotics cannot enter the periplasmic space
Blocking entry
What does this statement refer to: Gram-negative bacteria expels antibiotics to prevent them from reaching an effective concentration
efflux of antibiotic
What does this statement refer to: Minor modifications at this site can neutralize the effects of antibiotics
alteration of target molecule
What does this statement refer to: Uses Beta-lactamase to breakdown the beta-ring
inactivation by enzymes
What contributes to postoperative infections?
normal microbiota of operating room staff, using syringes more than once, errors in aseptic techniques, antibiotic resistance
In which of the following patterns of disease does the patient experience no signs or symptoms?
incubation and convalescence
Describe that pattern of microbial death:
the cells in a population die at a constant rate
Describe endemic disease:
constantly present in population at low levels
Describe epidemic disease:
present in population at abnormally high levels
Describe pandemic disease:
present worldwide at a high level
List, in order, the development of disease (5)
incubation
prodromal
illness
decline
convalescence

(I prod Ike Delicious Cone)