The MHC complex is a set of genes that
A. encodes cell recognition molecules.
B. is located on chromosome 6.
C. produces molecules to which antigens must attach in order to activate cell-mediated
immunity.
D. prevents the immune system from attacking the body's own tissues.
E. has all of these traits.
E
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Prokaryotes reproducing by binary fission can increase genetic variation by (select all correct choices):
A. mutation. B. DNA transfer during conjugation. C. obtaining DNA from the environment. D. obtaining DNA through viral infection. E. exchange of genetic material between homologous chromosomes.
To decrease air pollution created from sulfur emissions, your local power plant wishes to build tall smokestacks. The ultimate consequence of this would most likely be
A) biological magnification. B) dilution of sulfur pollutants in the atmosphere and thus reduction of their effects on the environment. C) creation of an environmental problem that is a distance from the power plant. D) a decrease in the pH of local lakes.
A (bacteriocidial/bacteriostatic/minimum) concentration of a drug is one at which microbes survive but are not able to grow and reproduce
What will be an ideal response?
Which of the following is NOT a component of bacterial flagella?
A. flagellin B. basal body C. tubulin D. filament E. hook