Which of the following intestinal parasites is found in humans and also in pigs?
a. G. lamblia
b. D. fragilis
c. Cryptosporidium spp.
d. Balantidium coli
D
B. coli is generally found in humans, but it is also found in pigs. In some areas of the world, pigs are considered important reservoir hosts for B. coli. It is classified as a ciliate, and humans ac-quire infections by ingesting food or water contaminated with fecal material containing the re-sistant, infective cyst stage of the protozoa.
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The average number of individuals of the same species per unit of surface area at a given time is the
a. population density b. population growth c. population birth rate d. population size e. carrying capacity
Four of the five choices listed below are barriers to
invasion. Select the exception. a. intact skin b. mucous membrane c. urine d. blood plasma e. lysozyme
A unique species of snail has been discovered in the Negev Desert. At night, these snails use a toothlike rasping organ in their head to scrape up porous limestone; they then digest the algae that lived in the rock pores. This scraping organ is the
A. mantle. B. labial palp. C. crop. D. tentacle. E. radula.
Southern blotting is a technique that can be used to identify microbes that cannot be cultured
Indicate whether the statement is true or false