Intestinal protozoan infections are typically spread by

A. the respiratory route.
B. blood transfusion.
C. body fluids.
D. the fecal-oral route.


D.

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

________ 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).

Biology & Microbiology