Induction of capsule formation by B. anthracis can be accomplished with _____ agar
a. 5% sheep blood
b. PLET acetate
c. bicarbonate
d. urea
C
As a means of identification, bicarbonate agar is used to induce B. anthracis capsule formation.
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A 29-year-old patient with acquired immunodeficiency syndrome (AIDS) is suspected of having a C. neoformans infection in the cerebrospinal fluid (CSF). A CSF specimen is collected and set up on cycloheximide agar. In addition, an India ink stain is set up. The India ink stain reveals encapsulated yeast; however, 3 weeks later, the cycloheximide agar is negative. Which one of the following
statements explains this discrepancy? a. The India ink result is most likely false positive. b. The ingredients in the cycloheximide agar most likely inhibited the growth of the organism. c. C. neoformans is rarely recovered from CSF; therefore the cycloheximide result is accurate. d. The India ink stain is most likely conta-minated.
Walleye pike tend to live in deep waters and feed at night. Northern pike live in shallower waters and feed all day. Which of the following best explains these differences?
A. mutualism B. commensalism C. resource partitioning D. parasitism E. predation
The vertebrate forelimb initially develops in the embryo as a solid mass of tissue. As development progresses, the solid mass near the end of the forelimb is remodeled into individual digits. Which of the following best explains the role of apoptosis in remodeling of the forelimb?
A) Apoptosis replaces old cells with new ones that are less likely to contain mutations. B) Apoptosis involves the regulated activation of proteins in specific cells of the developing forelimb that leads to the death of those cells. C) Apoptosis involves the destruction of extra cells in the developing forelimb, which provides nutrients for phagocytic cells. D) Apoptosis in the developing forelimb triggers the differentiation of cells whose fate was not already determined.
Experiments are carried out to test a hypothesis by changing one variable at a time and including an unchanged variable termed a(n)
A. altered variable. B. control. C. experimental variable. D. stable variable.