Activator proteins in prokaryotes experience shape changes in the presence or absence of small molecules. As a consequence: (Select all correct choices)
A. they may activate genes needed only
when such a small molecule is present in the
cell.
B. they may activate genes necessary to
synthesize a specific small molecule.
C. they are unable to act alone.
A,B
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How might the removal of a wetland affect a nearby city?
A. Wetlands support a rich supply of nutrients, so the removal of a wetland would decrease the water quality. B. Wetlands reduce water quality, so the removal of a wetland would improve the water quality. C. Wetlands reduce flooding, so the removal of a wetland would increase the likelihood of the city flooding. D. Wetlands cause flooding, so the removal of a wetland would decrease the likelihood of the city flooding.
During attachment of phage to E. coli, the phage
A. actively seek out the bacteria. B. randomly bump into the bacteria. C. attach to proteins or carbohydrates on the bacterial surface. D. attach to the bacterial RNA. E. randomly bump into the bacteria AND attach to proteins or carbohydrates on the bacterial surface.
During which response to the antigen do we display a latent period of no secretory antibody synthesis?
A. Primary B. Tertiary C. Quaternary D. Secondary
A human population that is shrinking would be characterized by:
a. a large proportion of prereproductive individuals. b. a small proportion of prereproductive individuals. c. a large proportion of reproductive individuals. d. an equal number of individuals of all age groups. e. a small proportion of postreproductive individuals.