A gram-positive bacillus identified as Lactobacillus is isolated in large quantities from the urine of a 16-year-old female. Based on this information, the patient should receive which antibiotic?
a. Penicillin
b. Tetracycline
c. Vancomycin
d. No antibiotics should be administered.
D
Since Lactobacillus is normal vaginal flora, its presence in urine is usually insignificant and con-sidered a contaminant; therefore, antibiotic therapy is not administered.
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Puffballs and bracket fungi are most closely related to:
a. molds. b. truffles. c. the common edible mushroom. d. yeast. e. the black bread mold.
Chlorophyll a and the accessory pigments of a photosystem act as an antenna by:
A) absorbing energy from NADPH and passing it on. B) being the primary electron acceptor. C) absorbing energy from sunlight and passing it on. D) absorbing CO2 and passing it on.
Effects that are dependent on the size of the population and regulate the growth of populations are called ________ effects.
A. demographic B. K-related C. density-dependent D. density-independent E. environmental resistance
What effect of mass extinctions is described by the expression "dead clade walking?"
What will be an ideal response?