Which of the following ions does not contribute to information flow in a nervous system?
A. chloride
B. calcium
C. hydrogen
D. potassium
C
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Diseases that are good candidates for eradication have
A) only a human reservoir. B) no asymptomatic phase. C) an environmental reservoir. D) only a human reservoir and no asymptomatic phase.
Currently, there are bald eagles living in _____ states
a. 28 b. 48 c. 49 d. 50
Viruses that kill their host cells during each cycle of infection are called
a. virulent bacteriophages. b. bacteriophages. c. temperate bacteriophages. d. phages. e. avirulent bacteriophages.
A substance is most likely to diffuse into a cell when
(1) it is a large organic food molecule such as protein or starch (2) it is enclosed in an organelle such as a vacuole (3) the concentration of the substance is greater outside the cell than inside (4) the pH of the substance is greater than the pH of the cell