Which of the following sigma factors would be expected to associate with RNA polymerase after increasing the incubation temperature of an E. coli culture from 30°C to 42°C?
A. ?28
B. ?32
C. ?38
D. ?42
E. ?54
B
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In the figure above, which of the arrows represents the carrying capacity?
A) arrow A B) arrow B C) arrow C D) Carrying capacity cannot be found in the figure because species under density-dependent control never reach carrying capacity.
A benign tumor (select all correct choices):
A. is a mass of rapidly dividing cells. B. has clear boundaries encapsulating it and is not invading nearby tissues. C. rarely has life-threatening effects unless it is interfering with the function of a vital organ. D. has defects in the regulation of cell division.
Which bone completely surrounds the foramen magnum?
a. frontal b. mandible c. sphenoid d. temporal e. occipital
A special group of chemical substances that are used to treat diseases caused by microbes:
A) antibiotics B) synthetic drugs C) semi-synthetic drugs D) antimicrobial agent