For most pathogens to be diagnostic of current infection, there must be 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, is con-sidered to be diagnostic of current infection.

Biology & Microbiology

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An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The surviving population happens to have broader stripes, on average, than the initial population. If broadness of stripes is genetically determined,

what effect has the ground-squirrel population experienced during the earthquake? A) directional selection B) disruptive selection C) a founder event D) a genetic bottleneck E) gene flow

Biology & Microbiology

____ in angiosperms occurs when a sperm cell "fertilizes" a diploid (2n) cell within the future seed (eventually forming a triploid (3n) endosperm), and a second sperm fertilizes a haploid (1n) egg

Fill in the blank with the appropriate word.

Biology & Microbiology

A bundle of ____ extends from the base to the tip of a eukaryotic flagellum or cilium

a. microtubules b. microfilaments c. actin d. cytokeratin e. intermediate filaments

Biology & Microbiology

Which of the following is NOT an organic molecule?

a. cholesterol b. ATP c. water d. glucose e. lipid

Biology & Microbiology