Which chemical released by white blood cells causes arterioles to dilate?
a. cytokines
b. histamine
c. interferons
d. complement
e. interleukins
B
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Diphtheria is an acute contagious disease caused by an exotoxin that
A. functions by inhibiting protein synthesis. B. can be neutralized as a result of immunity produced by the DTaP vaccine. C. may cause destruction of cardiac, kidney and nerve tissues. D. All of the choices are correct.
Diatoms reproduce by binary fission
Indicate whether the statement is true or false
Fungi are genetically most closely related to
a. ferns. b. flowering plants. c. algae. d. animals. e. none of these.
In photosynthesis C3, plants differ from C4 plants in
A. the way they capture light. B. the way they capture carbon dioxide. C. the kind of chlorophylls they have. D. None of the choices is correct.