An ecosystem includes ________ along with ________
A) macroorganisms / microorganisms
B) living organisms / their chemical and physical environments
C) pathogenic organisms / non-pathogenic organisms
D) single celled organisms / multi-cellular organisms
Answer: B
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A patient specimen was Gram-stained upon arrival in the clinical laboratory and revealed both Gram-positive cocci and Gram-negative bacilli. The specimen was cultured on sheep blood agar and chocolate agar, and after incubation, the culture grew only the Gram-negative bacilli. Which of the following is/are a likely explanation(s) for the failure of the Gram-positive cocci to grow?
A. The Gram-negative bacilli may have grown very quickly and overgrew the slower growing Gram-positive cocci. B. The growth temperature may have enabled the growth of the Gram-negative bacilli but not the growth of the Gram-positive cocci. C. The Gram-positive cocci may be an obligate anaerobe and was unable to grow in an ambient air incubator. D. The media used may not support the growth of the Gram-positive cocci. E. All of the choices are possible explanations.
At the arteriole end of the capillary, more fluid leaves
the capillary than enters as a result of a. osmotic pressure. b. hydrostatic pressure c. gap junctions. d. vasodilation. e. all of these.
Which of the following should be present in the
human diet in the highest percentage? a. protein b. carbohydrate c. lipid d. vitamins e. minerals
The virulence factor in Vibrio parahaemolyticus is the thermostable hemolysin (Kanagawa hemolysin).
a. true b. false