Epithelial cells serve as a barrier to prevent non-specific movement of chemicals from one side of the epithelium to the other side.
a. true
b. false
Answer: a. true
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WASH initiatives are public health initiatives that address WAter, Sanitation, and Hygiene. Which of the following diseases would not be expected to show a decrease in prevalence following a successful WASH campaign?
A. Clostridium difficile infection B. Entamoeba infection C. Schistosomiasis D. Shigella infection E. Ascaris lumbricoides infection
Which country has the biggest ecological footprint?
a. France b. United States c. China d. India e. Canada
The cell junction labeled "B" in the figure
a. prevents movement of materials between cells. b. allows passage of a signal to contract heart muscles. c. allows the free passage of materials between cells. d. is found mostly in stomach tissue. e. is found in most tissues except heart muscle.
The streptomycetes form spores by division of the cells of the aerial mycelia in ________.
A. two division planes consecutively B. two division planes simultaneously C. multiple division planes D. a single division plane