Which of the following white blood cells are equipped with receptors for specific antigens?
a. neutrophils
b. basophils
c. eosinophils
d. dendritic cells
e. B and T lymphocytes
E
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Generally, exotoxins tend to be more heat stable than endotoxins.
Answer the following statement true (T) or false (F)
Since all action potentials are identical, the intensity of a sensation depends on:
a. whether a myelinated or unmyelinated neuron has been stimulated. b. the duration of the stimulation. c. whether the neuron stimulated is a pre- or postsynaptic neuron. d. the total number of neurons stimulated and the frequency of their discharge. e. the presence of an EPSP or IPSP, which allows for a graded response
Which type of phagocytic immune cell would you find in the nasal epithelium?
A. basophil B. natural killer cell C. macrophage D. mast cell E. monocyte
You arrive back in the United States after a visit to a foreign country located on another continent. The customs agent stops the person in front of you and confiscates the fruit basket this person is bringing home. Being the knowledgeable person you
are, you calmly explain to your enraged fellow traveler that the reason for the detainment is that the fruit basket may be A) carrying endangered fruit. B) carrying an exotic species that could damage North American ecosystems. C) contaminated with chemicals that will damage the ozone layer above North America. D) contaminated with sufficient DDT to cause serious harm to anyone who eats the fruit.