Which layer of the digestive tract contains blood and lymph vessels?
a. mucosa
b. circular muscle
c. longitudinal muscle
d. submucosa
e. serosa
ANSWER: d
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The minimum amount of energy needed to get a chemical reaction started is called the ____ energy
a. activation b. reaction c. enzymatic d. chemical e. triggering
Although birds, fish, mammals, reptiles and amphibians are different, evidence of their evolutionary
links is provided by a. chemical analysis. b. comparison of adult body forms. c. comparison of ways in which their embryos develop. d. time of gestation. e. comparing life expectancies.
The most selectively toxic drugs are those that
A. target microbial sites that are not present in humans, e.g., the bacterial cell wall. B. cause damage to host tissues. C. cause allergic reactions in humans. D. target structures present in both microbes and humans, thus causing host tissue damage.
________ is the procedure in which a harmless form of an antigen from a pathogen is introduced into the body in order to stimulate an immune response to that antigen
Fill in the blank(s) with correct word