The time period during a clinical infection when the infectious agent multiplies at high levels and exhibits its greatest toxicity is known as the ______
Fill in the blank(s) with the appropriate word(s).
period of invasion
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A widely used nontreponemal serologic assay is the ________ test
a. rapid plasma reagin (RPR) b. Treponema pallidum passive particle ag-glutination (TP-PA) c. fluorescent treponemal antibody absorp-tion test (FTA-ABS) d. microhemagglutination test for antibody to T. pallidum (MHA-TP)
If drugs are less effective when taken together than when each is taken separately, they are called
A. energetic. B. antagonistic. C. additive. D. synergistic.
In the experiment by Davis et al., only fibroblast cells that took up the cloned myoD gene differentiated into muscle cells. This is because
A. only those cells contained muscle-cell-specific enhancer sequences. B. MyoD is a transcription factor that turned on muscle-specific genes such as myosin C. MyoD is a transcription factor that shut off fibroblast specific genes, allowing the muscle cell characteristics to show up D. MyoA and MyoH are transcription factors that shut off muscle-specific genes E. myoD is the gene for myosin and the presence of myosin converts the fibroblast into a muscle cell
Passive immunization ____
a. involves exposure to antigens b. is an innate immune response c. passive immunization is given only to adults d. results in memory cell formation e. involves receiving antibodies from another individual