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
B
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Two structures that allow bacteria to adhere to surfaces are ________ and ________.
A. endospores; metachromatic granules B. fimbriae; capsules C. pili; ribosomes D. lipopolysaccharide; techoic acid E. actin filaments; phospholipid membranes
These dead cells conduct water and minerals
and have pits in their cell walls. This cell is
a. a sieve-tube member. b. a sclerenchyma. c. a vessel member. d. a tracheid. e. more than one of these
Biological membranes are normally permeable to:
a. large, hydrophilic molecules. b. small, hydrophilic molecules. c. large, hydrophobic molecules. d. small, hydrophobic molecules. e. ABC transporters
Which of the following statements about autoinducers is incorrect?
A. They bind directly to DNA to activate transcription. B. They can activate the cell that secreted them. C. N-acylated homoserine lactones are autoinducers in gram-negative cells. D. Autoinducers may stimulate the production of virulence factors