The bacterium that causes botulism disease is harmless until it:
a. is infected by lytic bacteria.
b. is infected by certain retroviruses.
c. contains a certain prophage DNA.
d. is irradiated by UV radiation.
e. is infected by prions
C
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________ is the acquired inability to mount an adaptive immune response against self
A) Memory B) Specificity C) Tolerance D) Immunogenicity
You wish to obtain a pure mitochondria sample from lysed cells. The best way to obtain this sample would be
A) centrifugation. B) chromatography. C) polyacrylamide gel electrophoresis. D) agarose gel electrophoresis. E) both choices A and C
Which of the following are normally
associated with asteroids or their impact on Earth?
a. iridium b. tektites c. shocked quartz d. craters e. all of these
In his study of the Mediterranean fruit flies (Ceratitis capitata), Matthew Gage (1991 ) found that ________
A) males allowed to mate alone produced 2 1/2 times more sperm than those mating in the presence of other males B) males allowed to mate alone produced 2 1/2 times less sperm than those mating in the presence of other males C) males produced the same amount of sperm when they were allowed to mate alone or when they mated in the presence of other males D) males engaged in aggressive behavior when mating in the presence of other males