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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology