Polar and charged molecules typically cross the cell membrane by way of ____
a. simple diffusion
b. osmosis
c. filtration
d. active transport
e. facilitated diffusion
ANSWER: e
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Which one of the following statements is not true about the disk-diffusion method of antimicrobial susceptibility testing? (Note: information about susceptibility testing can be found on the CD-ROM that accompanies this book.)
A) A pure culture of the organism is required. B) It is also known as the “Kirby-Bauer test.” C) The plate should be incubated in a CO2 incubator for 12 hours. D) The test should be performed in the exact manner described by the Clinical and Laboratory Standards Institute (CLSI).
The most effective antiseptic agent against blood spills and therefore the antiseptic of choice in laboratories where these agents are likely found is:
a. 70% ethanol. b. phenol compound. c. absolute ethanol. d. 10% bleach.
The swapping of corresponding segments between homologous chromosomes is ____________________. Fill in the blank(s) with the appropriate word(s)
Identify a sequence that is most likely to be recognized by a restriction enzyme.
A. TCATCA B. CGATGC C. CCCTTT D. TGGCCA