Micro Lab - Exam 2

staphylococcus aureus produces ____ that coagulates plasma

coagulase

what is the inflammation in the urinary bladder?

cystitis

staphylococci are

facultative anaerobes

staphylococci are ____ irregular cluster like grapes

gram-positive cocci

you cultured e coli in a phenol red glucose broth overnight. The color of phenol red changed from red to yellow. What does it mean?

E. coli fermented glucose

after culture of bacteria, the red color of urea broth that contains phenol red indicates that urease produced by the bacteria converted urea into ____. what is the name of molecule in the blank?

ammonia

what enzyme hydrolyzes starch?

amylase

the presence of bacteria in voided urine is __

bacteriuria

staphylococcus aureus is

beta-hemolytic

which one of the UTI is more common?

cystitis

in addition to basic nutrients, ________ media contain one or more components, such as a particular carbohydrate, that can be used by some microorganisms but not by others. if the microorganism uses the component during the incubation period, a change occurs in an indicator that is also included in the medium, which results in a color change in the medium

differential

which of the following is the most frequent cause of UTI?

e coli

staphylococcus aureus produces ____ that destroys blood cells

hemolysins

what is the type of UTI that generally begins in your urethra or bladder and travels to and multiply in one or both of your kidney?

pyelonephritis

which of the following has the risk of infection in urinary bladder and cystitis?

sampling catherized urine specimens

in addition to basic nutrients, ____ media contain one or more components that suppress the growth of some microorganisms without seriously affecting the ability of others to grow

selective

you inoculated 0.01 ml of clean-catch voided urine sample on a nutrient agar plate, and incubated at 35C over night. Next day, the number of colonies on the plate was 1100. This urine sample has ____ bacteriuria.

significant

which of the following is the major cause of nosocomial infections?

staphylococcus aureus

which of the following is implicated in acute urinary tract infections in women between 16-25?

staphylococcus saprophytic

what is not true about normal flora?

the microbial normal flora doesn't change with age, human activity, and environmental influences

T/F: any microorganism is potentially pathogenic if it enters a susceptible host

true

indole test examines the presence of the enzyme ____ in bacteria. what is the name of the enzyme in the blank?

tryptophanase

staphylococcus epidermidis and staphylococcus saprophyticus don't cause serious infections because they don't produce _____ factors such as hemolysins, coagulase, leukocidin

virulence

which of the following has the probability of contamination by urogenital flora during sampling procedure?

voided urine sampling