What is the term given to a random subset of individuals who are selected for measurement in a particular study?
A) controls B) sample C) placebos D) representatives
Answer: B
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All of the following choices delay or block expression of a gene except ________
a. expression of a microRNA complementary in sequence to the gene b. the binding of a repressor to certain sites on DNA c. methylation of DNA d. the binding of an activator to a promoter
An example of evolutionary divergence is best characterized by Darwin's observation of ____
a. fossils along the coast of Argentina b. body armor similarities between armadillos and fossilized glyptodonts c. differences in appearance of nutria and beaver d. differences in bill shape and food habits of finches e. the great variety of form of species
____ are molecules that regulate defense responses via signal transduction pathways
a. Complement b. Histamines c. Prostaglandins d. Cytokines e. Opsonins
Which of these is not produced by phagocytes to destroy engulfed microorganisms
a. hydroxyl radicals b. superoxide anion c. hydrogen peroxide d. histamine