Symptoms of plague appear in
A. two to three months.
B. one to two years.
C. three to six hours.
D. one to six days.
D
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Gonyaulax
A. produces a non-protein neurotoxin. B. infects the nervous system of humans. C. is a dinoflagellate. D. produces a non-protein neurotoxin AND is a dinoflagellate.
The diameter of a blood vessel will be reduced by the contraction of ________
a. cardiac muscle b. smooth and cardiac muscles c. skeletal and cardiac muscles d. smooth muscle e. skeletal muscle
When biologists Hetz and Bradley measured the oxygen concentration inside the tracheae of Atlas moth pupae, what hypothesis were they testing?
A. Discontinuous breathing protects against too much oxygen. B. Discontinuous breathing decreases water loss. C. Discontinuous breathing helps underground insects avoid high levels of carbon dioxide. D. Discontinuous breathing saves energy by not moving the diaphragm. E. Discontinuous breathing is harmful because less oxygen is taken up.
Four of the following statements correctly describe lichens. Which statement is the exception?
a. They inhabit harsh environments. b. They contain a club fungus. c. They may have proceeded the evolution of land plants. d. They may be a mutualism between and alga and a fungus. e. They can contain cyanobacteria.