WGU Clinical Microbiology Exam 3
Questions and Answers
the most specific an exclusive taxon used in the classification of microrganisms is:
-order
-species
-family
-genus (CORRECT ANSWER) species
classification and naming of organisms is useful in diagnostic microbiology for all of
the following except:
-provides standardied groups for identification
-standardized groupings similar phenotypic traits
-standardized groupings are always genotypically similar at >98%
-organisms within a standard group maybe identified using similar methods
(CORRECT ANSWER) provides standardied groups for identification
which of the following is considered an indirect mode of transmission?
-a cut with a dirty knife
-ingesting contaminated potato salad
-drinking water from a contaminated source
-inhaling a droplet containing a bacterium (CORRECT ANSWER) a cut with a dirty
knife
nonspecific immunity includes all of the following except
-inflammation
-B cell activation to produce antibodies
-resident normal flora
-phagocytosis (CORRECT ANSWER) B cell activation to produce antibodies
a sign is different from a symptom in all of the following ways except:
-it is believed to be associated with the etiology of the diseases
-it is clearly visible
-it provides measurable data
-it includes the temp,respiratory rate and pulse (CORRECT ANSWER) it provides
measurable data
a microorgansism that colonizes the skin but is capable of causing an infection under
the appropriate conditions is referred to as:
-normal flora
-a nosocomial pathogen
-an opportunistic pathogen
,-a pathogenic organism (CORRECT ANSWER) an opportunistic pathogen
all of the following are differential media except:
-eosin methylene blue agar (EMB)
-Chocolate (CA)
-macConkey's agar (MAC)
-blood agar (CORRECT ANSWER) Chocolate (CA)
the BEST description of selective media is:
-are utilized for growth of fastidious organisms
-allow growth of all organisms
-maybe differential
-contains dyes or antibiotics to suppress the growth of some organisms (CORRECT
ANSWER) contains dyes or antibiotics to suppress the growth of some organisms
a urine specimen was collected at 8am. The nurse labeled the sample and placed it
next to the tube station to be sent to the lab for testing. The specimen was received
in the lab for culter at 1pm on the same day. The microbiologist should:
-set up a routine bacteriology culture and note the time
-set up a routine bacteriology culture
-call the nurse to explain why the specimen was rejected and request a new sample
-reject the specimen (CORRECT ANSWER) call the nurse to explain why the
specimen was rejected and request a new sample
True or False: EDTA is commonly used to collect blood for specimens in the
micrbiology lab (CORRECT ANSWER) false
True or False: microbiologic specimens should be set up within 2 hrs of collection
(CORRECT ANSWER) false
teichoic acids, mycolic acids, peptidoglycan, and disaccharide-pentapeptide subunits
are all building blocks of which bacterial structure?
-flagella
-outer cell membrane
-inner cell membrane
-cell wall (CORRECT ANSWER) cell wall
the major difference between gram positive and gram negative bacteria is that:
-the peptidoglycan layer in the gram positive bacteria is substantially thinner than in
gram negative bacteria
-flagella are only present in gram positive bacteria
-gram negative bacteria contains an outer membrane that functions as the cells
intitial barrier to the env.
, -gram positive bacteria contains a periplasmic space, whereas a gram negative
bacteria does not (CORRECT ANSWER) gram negative bacteria contains an outer
membrane that functions as the cells intitial barrier to the env.
a pathway that generates ATP by substrate level phosphorlyation does not require
O2 and produces various end products, including alcohols, acids, CO2, and H is:
-substrate level phosphorylation
-oxidative phosphorylation
-aerobic respiration
-fermentative metabolism (CORRECT ANSWER) fermentative metabolism
the persistent survival of microorganisms on a surface of the human body is called
a(n):
-infection
-colonization
-reservoir
-nosocomial infection (CORRECT ANSWER) colonization
toxic shock syndrome is attribute to the infection with
-staphylococcus epidermidis
-staphylococcus saprophyticus
-staphylococcus hominis
-staphylococcus aureus (CORRECT ANSWER) S. aureus
slime production is associated with which staphylococcus species?
-S. aureus
-S.saprophyticus
-S. epidermidis
-S. intermedius (CORRECT ANSWER) S. epidermidis
staphylococcus saprophyticus is best differentiated from staphylococcus epidermidis
by resistance to
-bacitractin
-penicillin
-novobiocin
-lysostaphin (CORRECT ANSWER) novobiocin
the following results were observed by using a tube coagulase test
coag at 4 hrs: positive
hemolysis on blood agar: beta
novobiocin: sensitive
mannitol salt agar: positive (acid production)
what is the probable identification?
Questions and Answers
the most specific an exclusive taxon used in the classification of microrganisms is:
-order
-species
-family
-genus (CORRECT ANSWER) species
classification and naming of organisms is useful in diagnostic microbiology for all of
the following except:
-provides standardied groups for identification
-standardized groupings similar phenotypic traits
-standardized groupings are always genotypically similar at >98%
-organisms within a standard group maybe identified using similar methods
(CORRECT ANSWER) provides standardied groups for identification
which of the following is considered an indirect mode of transmission?
-a cut with a dirty knife
-ingesting contaminated potato salad
-drinking water from a contaminated source
-inhaling a droplet containing a bacterium (CORRECT ANSWER) a cut with a dirty
knife
nonspecific immunity includes all of the following except
-inflammation
-B cell activation to produce antibodies
-resident normal flora
-phagocytosis (CORRECT ANSWER) B cell activation to produce antibodies
a sign is different from a symptom in all of the following ways except:
-it is believed to be associated with the etiology of the diseases
-it is clearly visible
-it provides measurable data
-it includes the temp,respiratory rate and pulse (CORRECT ANSWER) it provides
measurable data
a microorgansism that colonizes the skin but is capable of causing an infection under
the appropriate conditions is referred to as:
-normal flora
-a nosocomial pathogen
-an opportunistic pathogen
,-a pathogenic organism (CORRECT ANSWER) an opportunistic pathogen
all of the following are differential media except:
-eosin methylene blue agar (EMB)
-Chocolate (CA)
-macConkey's agar (MAC)
-blood agar (CORRECT ANSWER) Chocolate (CA)
the BEST description of selective media is:
-are utilized for growth of fastidious organisms
-allow growth of all organisms
-maybe differential
-contains dyes or antibiotics to suppress the growth of some organisms (CORRECT
ANSWER) contains dyes or antibiotics to suppress the growth of some organisms
a urine specimen was collected at 8am. The nurse labeled the sample and placed it
next to the tube station to be sent to the lab for testing. The specimen was received
in the lab for culter at 1pm on the same day. The microbiologist should:
-set up a routine bacteriology culture and note the time
-set up a routine bacteriology culture
-call the nurse to explain why the specimen was rejected and request a new sample
-reject the specimen (CORRECT ANSWER) call the nurse to explain why the
specimen was rejected and request a new sample
True or False: EDTA is commonly used to collect blood for specimens in the
micrbiology lab (CORRECT ANSWER) false
True or False: microbiologic specimens should be set up within 2 hrs of collection
(CORRECT ANSWER) false
teichoic acids, mycolic acids, peptidoglycan, and disaccharide-pentapeptide subunits
are all building blocks of which bacterial structure?
-flagella
-outer cell membrane
-inner cell membrane
-cell wall (CORRECT ANSWER) cell wall
the major difference between gram positive and gram negative bacteria is that:
-the peptidoglycan layer in the gram positive bacteria is substantially thinner than in
gram negative bacteria
-flagella are only present in gram positive bacteria
-gram negative bacteria contains an outer membrane that functions as the cells
intitial barrier to the env.
, -gram positive bacteria contains a periplasmic space, whereas a gram negative
bacteria does not (CORRECT ANSWER) gram negative bacteria contains an outer
membrane that functions as the cells intitial barrier to the env.
a pathway that generates ATP by substrate level phosphorlyation does not require
O2 and produces various end products, including alcohols, acids, CO2, and H is:
-substrate level phosphorylation
-oxidative phosphorylation
-aerobic respiration
-fermentative metabolism (CORRECT ANSWER) fermentative metabolism
the persistent survival of microorganisms on a surface of the human body is called
a(n):
-infection
-colonization
-reservoir
-nosocomial infection (CORRECT ANSWER) colonization
toxic shock syndrome is attribute to the infection with
-staphylococcus epidermidis
-staphylococcus saprophyticus
-staphylococcus hominis
-staphylococcus aureus (CORRECT ANSWER) S. aureus
slime production is associated with which staphylococcus species?
-S. aureus
-S.saprophyticus
-S. epidermidis
-S. intermedius (CORRECT ANSWER) S. epidermidis
staphylococcus saprophyticus is best differentiated from staphylococcus epidermidis
by resistance to
-bacitractin
-penicillin
-novobiocin
-lysostaphin (CORRECT ANSWER) novobiocin
the following results were observed by using a tube coagulase test
coag at 4 hrs: positive
hemolysis on blood agar: beta
novobiocin: sensitive
mannitol salt agar: positive (acid production)
what is the probable identification?
