Where are the basidia located in a typical toadstool?
A. lining the gills
B. on top of the cap
C. within the central stalk
D. within the underground mycelium
E. Any of the answer options depending on
the species.
A
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Match the following items with the correct phrases.
_______1. A decreased number of white blood cells in the peripheral bloodstream. _______2. Increase in the diameter of blood vessels; an initial event in inflammation. _______3. An increased number of white blood cells in the peripheral bloodstream. _______4. Considered to be the first phase of phagocytosis; the means by which phagocytic cells are attracted to sites where they are needed. a. chemotaxis b. leukocidin c. leukocytosis d. leukopenia e. vasodilation
In a hormone-stimulated signaling system, the concentration of hormone exposed to the receptor is
A) always equal to the receptor Kd for binding the hormone. B) never equal to the receptor Kd for binding the hormone. C) below the receptor Kd for binding the hormone before stimulation of hormone secretion. D) above the receptor Kd for binding the hormone before stimulation of hormone secretion. E) always constant.
The vitelline layer of the sea urchin egg
A) is outside of the fertilization membrane. B) releases calcium, which initiates the cortical reaction. C) has receptor molecules that are specific for binding acrosomal proteins. D) is first visible only when organogenesis is nearly completed. E) is a mesh of proteins crossing through the cytosol of the egg.
Which of the following is an opportunistic pathogen?
A) Pneumocystis B) Legionella C) Histoplasma D) Mycoplasma E) rhinovirus