In order to prevent spread of microorganisms from the microbiology laboratory, the room air should be
A. under positive pressure.
B. under negative pressure.
C. filtered.
D. chilled.
E. under negative pressure AND filtered.
E
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Transition mutations can result from
A. chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base. B. a small insertion or deletion. C. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces and chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base. D. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces.
________ is the direct migration and penetration of cancer cells into neighboring tissues.
Fill in the blank(s) with the appropriate word(s).
Red blood cells crenate (SHRINK) in what type of solution
a. hypertonic b. hypotonic c. isotonic d. none of these
In Gram staining, ethanol-acetone is used as a
A. decolorizing agent. B. counterstain. C. mordant. D. drying agent. E. primary stain.