Which of the following diagnostic procedures depends on precipitation of antigen-antibody complexes?
A. blood typing
B. immunodiffusion
C. viral hemagglutination inhibition tests used to diagnose viral infections
D. ELISA
E. fluorescent antibody tests
Answer: B
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Organisms such as Streptococcus pyogenes and Staphylococcus aureus that produce leukocidins are called ________ pathogens
A) pyogenic B) radical C) enterotoxigenic D) hemorrhagic
Thyroid hormone is to amphibian metamorphosis as ________ is to insect molting.
A. estogen B. aldosterone C. ecdysone D. cortisol E. butterfly peptide
A pair of cells that surrounds each stoma and controls its opening and closing are the
A. companion cells. B. guard cells. C. sieve tube cells. D. pith cells. E. vascular cells.
The promotion phase of carcinogenesis refers to
A) enhanced levels or exposures to a carcinogen B) metabolic oxidation by a P450 cytochrome C) normal cell progression to a precancerous cell D) precancerous cell progression to a cancerous cell E) the amount of DNA damage in a cell