A bacterium is found that is resistant to the antibiotic gentamicin. The bacterium was isolated in a hospital where patients were routinely given gentamicin for a variety of infections. What was the pressure that selected for this resistant population?
A) presence of gentamicin in the environment
B) high mutation rate for the bacterium
C) growth situation for the bacterium
D) patients that did not receive the antibiotic
A) presence of gentamicin in the environment
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When choosing among competing cladograms, the preferred hypothesis is the one that is the simplest for all characters and their states. This is also known as
A. the maximum likelihood approach. B. the principle of parsimony. C. the Bayesian method. D. the molecular clock. E. the cladistic approach.
Bioluminescence involves all of the following
EXCEPT a. stable electrons. b. ATP. c. oxygen. d. luciferin. e. luciferase.
If cell walls or are not perforated,
a. xylem and phloem will not be able to function as vascular tissue. b. gas exchange will not occur across the stomata. c. water will not enter the epidermal cells of the root. d. the terminal bud will not cause the stem to elongate. e. all of these will occur.
If solution of A is hypotonic to B, then the direction of net movement of water is B to A
__________________ Indicate whether the statement is true or false.