To read the hemolytic reaction accurately on a blood agar plate, the technologist must:
a. hold the plate up to the light, and observe the plate with the light coming from be-hind.
b. hold the plate under the light, and observe the plate with the light coming from the top.
c. hold the plate over a white background.
d. examine the plate using reflected and transmitted light.
A
Transmitted light (i.e., passing through the agar) is required to interpret the hemolytic reaction properly on blood agar.
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A) complementation. B) immunization. C) opsonization. D) tolerance.
What happens to contrast and resolving power when the aperture of the condenser (i.e., the size of the hole through which light passes before it reaches the specimen) of a compound light microscope is decreased?
What will be an ideal response?
Which of the following is not true of the lymph vascular system?
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Amniocentesis involves sampling
a. the fetus directly. b. the fetal cells floating in the amniotic fluid. c. sperm. d. blood cells. e. placental cells.