For an accurate diagnostic of a current infection, acute and convalescent sera should reflect a(n) _____ in the patient's antibody titer of _____ doubling dilutions
a. decrease; two
b. increase; two
c. decrease; four
d. increase; four
B
A fourfold rise in titer, that is, an increase in the patient's titer of two doubling dilutions from acute to convalescent, is considered to be diagnostic of current infection.
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A. order B. phylum C. genus D. species
A biological species is defined as a population whose members can interbreed, although the offspring may be infertile.
a. true b. false
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a. carboxypeptidase b. amylase c. trypsin d. chymotrypsin e. pepsin
________ is (are) a crucial nutrient reservoir of phosphorus that is available to organisms
A) The atmosphere B) Consumers C) Autotrophs D) Oceans E) Rocks