Intestinal protozoan infections are typically spread by
A. the respiratory route.
B. blood transfusion.
C. body fluids.
D. the fecal-oral route.
D.
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The organism responsible for destroying Ireland's potato crop in the mid-1800s, causing famine, is a member of the genus ________
a. Saprolegnia b. Sargassum c. Phytophthora d. Porphyra
During a relative refractory period:a
an axon can transmit impulses comparable to a resting neuron. b. an axon cannot transmit an action potential at all. c. an axon can transmit impulses, but the threshold level is higher. d. all voltage-activated sodium channels are inactivated. e. neurons can only transmit several impulses per second.
Which of the following is NOT one of the four steps involved in phagocytosis?
A) exocytosis B) attachment C) internalization D) interleukin release E) degradation
________ isolating mechanisms include improper development of hybrids and failure of hybrids to become established in nature.
Fill in the blank(s) with the appropriate word(s).