Which of the following statements regarding eye infections is correct?
A. Eye infections may be opportunistic infections by the normal microbiota of the eye.
B. Lysozyme in tears targets the gram-negative microbes that contact the eye.
C. Immune privilege restricts virtually all microbes from the tissues of the eye.
D. Inflammation occurs in most eye infections and serves to initiate repair of the damaged tissue.
Answer: A
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Which of the following species concepts might differentiate species on the basis of descent from a common ancestor?
A. Ring species B. Ecological species C. Evolutionary species
A group of organisms sharing a derived
character is a
a. clade. b. taxon. c. tribe. d. community. e. population
The weakest symbiotic association, in which one
species simply lives better in the presence of another species is a. commensalism. b. competitive exclusion. c. mutualism. d. facultative obligate mutualism. e. parasitism.
One possible fate for an exogenote is ________.
A. independent replication and functioning B. integration into the host chromosome C. degradation to nucleotides D. All of the choices are correct.