Disturbances in sensory neurons will result in an action potential if the
a. stimulus is graded.
b. stimulus remains local.
c. graded stimulus reaches a trigger zone.
d. localized stimuli do not spread far.
e. stimuli become downgraded to localized ones.
C
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Lysogeny probably carries a strong selective advantage for the host cell because it
A) prevents cell lysis. B) confers resistance to infection by viruses of the same type. C) confers resistance to infection by viruses of a different type (or strain). D) confers resistance to infection by many virus types and prevent cell lysis.
The positive control of the lactose operon in bacteria
is a. activated by a repressor protein. b. independent of glucose concentration. c. activated by allolactose d. regulated by RNA polymerase. e. none of these.
Natural selection occurs so an organism can become perfectly adapted to its environment
Indicate whether the statement is true or false
The ________ stain makes use of malachite green
A) negative B) flagellar C) endospore D) electron microscopy E) acid-fast