At the molecular level, the "choice" between lytic and lysogenic pathways is determined by:
A. the positive regulatory effects of a large
number of bacteriophage proteins produced
soon after infection.
B. the negative regulatory effects of a large
number of bacteriophage proteins produced
soon after infection.
C. the positive regulatory effects of a small
number of bacteriophage proteins produced
soon after infection.
D. the negative regulatory effects of a small
number of bacteriophage proteins produced
soon after infection.
E. the positive and negative regulatory effects
of a small number of bacteriophage proteins
produced soon after infection.
E
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Public health surveillance is the proactive evaluation of
A. emerging infectious agents. B. environmental conditions. C. human behaviors and lifestyle choices. D. genetic background. E. All of the choices are correct.
In which type of transfer do bacteria or archaea take up DNA from their environment and integrate it into their genome?
a. conjugation b. transduction c. transformation d. all horizontal e. vertical
Why do neurons generate an action potential, instead of simply relying on the opening of ion channels near the stimulus site to transmit information?
A. Because without the actions potential, changes in Vm at the stimulus site might not reach the axon terminal B. Because without the sectional potential, the neuron would not depolarise C. Because action potentials help the body keep ion concentrations at appropriate levels D. Because without the action potential, the neuron would not return to resting potential
For individuals planning a trip to another country, such as Vietnam, which organization is the best source for information on which vaccines might be necessary?
a. Centers for Disease Control and Prevention b. National Institutes of Health c. National Safety Council d. Tourist Travel Bureau