Inactivated tetanus toxin is a(n)
A) conjugated vaccine.
B) subunit vaccine.
C) nucleic acid vaccine.
D) inactivated whole-agent vaccine.
E) toxoid vaccine.
E
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CAM plants do not operate the Calvin cycle at night because ___________
A. sunlight is required to produce ATP and NADPH B. PEP carboxylase is only active in darkness C. CAM plants fix HCO3 - but the Calvin cycle requires CO2 D. CAM plants close their stomata during the day
Classical conditioning such as the salivating of Pavlov's dog in response to a metronome is based on a(n)
A. operant condition. B. sign stimulus. C. involuntary response. D. dishabituation. E. critical period.
Which of the following is (are) an effect(s) of auxin?
A. Trees sprayed with auxin will keep mature fruit from falling to the ground. B. Applied to a woody cutting, auxin causes roots to develop. C. Under the effect of gravity, auxin moves to the lower surface of roots and stems, causing roots to curve downward and stems to curve upward. D. Auxin production by seeds promotes the growth of fruit. E. All of the choices are effects of auxin.
In addition to a vertebral column, all vertebrates have
A. gills. B. scales. C. a distinctive head or skull. D. a tunic. E. an open circulatory system.