A media is designed that allows only staphylococci to grow. In addition, S. aureus colonies have a yellow halo around them and other staphylococci appear white. This type of media is
A. both selective and differential.
B. enriched.
C. differential only.
D. a reducing media.
E. selective only.
Answer: A
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The universal response when a ligand binds to a receptor is the ligand falls off.
a. true b. false
During the passage of a nerve impulse all of the following occur EXCEPT
a. sodium ions pass through gated channels. b. positive feedback causes more sodium ions to enter the cell. c. the interior of the cell becomes positive. d. changing voltage increases the number of open gates. e. changing voltage decreases the number of open gates.
Which bacteria is most likely to colonize a satin finished metal surface commonly used for biomedical procedures?
a) Staphylococcus aureus b) Staphylococcus epidermidis c) Streptococcus mutans d) Staphylococcus saprophyticus
In the United States, solid municipal waste can no longer be dumped ____
a. in garbage dumps b. in biodegradable bags c. in garbage bags d. in landfills e. in the sea