The blood agar plate of a urine specimen shows 100 colonies of a large gray wet beta-hemolytic organism. The MacConkey agar displays 20 colonies of a dark pink lactose fermenter. Both organisms are E. coli
How do you account for the difference in the number of colonies between the two agar plates?
A) There is a dilution effect as the agar is struck so there will be fewer colonies from agar to agar.
B) The technologist did not redip the loop into the urine before inoculation of the MacConkey.
C) The technologist did not flame the calibrated loop after inoculation of the blood agar plate.
D) E. coli grows much better on sheep blood agar than on MacConkey agar.
B
You might also like to view...
Bacteria that are categorized as surviving in an oxygen-rich environment are ________
a. anaerobes b. aerobes c. microbes d. all of the above
Which of the following is the last step that pharmacy technicians must take in making an ethical decision?
a. Identification b. Forming an action plan c. Evaluation d. Analyzing the data
Spherical or semi-spherical bacteria is known as
A) bacilli B) cocci C) spirilla D) coccobacilli
You must ________, or standardize, an aneroid sphygmomanometer frequently to ensure accurate results.
Fill in the blank(s) with the appropriate word(s).