Tight junctions in cells
a. prevent fluid leakage between adjacent cells.
b. are used only to stimulate cellular reproduction.
c. are binding sites for many drugs.
d. only occur in muscle tissue.
e. do none of these.
Answer: a
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Examples of the mycobacterial species that occur in humans and belong to the Mycobacterium tuberculosis complex include:
a. M. tuberculosis, nontuberculous myco-bacteria, M. bovis, and M. africanum. b. M. tuberculosis, M. gordonae, M. bovis BCG, and M. africanum. c. M. tuberculosis, M. bovis, M. avium, and M. intracellulare. d. M. tuberculosis, M. bovis, M. bovis BCG, and M. africanum.
What is most likely to occur if a parasite accidentally introduced into the Great Lakes kills 95% of all living organisms
living in the lakes? a. fusion in a hybrid zone b. evolution of a surviving organism c. mass extinction of the surviving organisms d. adaptive radiation of the surviving populations e. allopatric speciation in the surviving organisms
Which statement regarding viral species is true?
a. Viral species are not classified as part of any of the three domains. b. Viral species are taxonomically differentiated based upon their cell wall. c. Viral species are classified within the Kingdom Plantae in the Domain Eukarya. d. Viruses are classified as prokaryotes.
___________ are constructed of all four basic tissue types.
(a) Organs. (b) Systems. (c) Cells. (d) Organelles.