The phagocyte that kills about 20 bacteria before dying is the ____
a. eosinophils
b. macrophage
c. neutrophils
d. dendritic cell
e. basophils
c
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Which of the following type of reversible enzyme inhibitor binds to a site distinct from the substrate active site?
A. competitive B. uncompetitive C. mixed D. uncompetitive and mixed E. competitive, uncompetitive, and mixed
What structure do bacteria use during conjugation?
a. pili b. flagella c. ribosomes d. plasma membrane e. no bacterial structure; it relies on viral transfer
A radula is an organ found in
a. gastropods. b. chitons. c. bivalves. d. gastropods and chitons. e. gastropods, chitons, and bivalves.
Which of the following statements is true?
a. Organs receive either parasympathetic fibers or sympathetic fibers but not both. b. The sympathetic nervous system that supplies an organ will also provide parasympathetic fibers to it. c. Both the sympathetic and parasympathetic have either excitatory or inhibitory effects. d. The sympathetic branch of the sympathetic system usually speeds up the activities of the body. e. All of these are true.