Many bacterial infections are treated with drugs, such as penicillin and sulpha drugs, that ____ the bacterium’s
enzyme activity.
a. inhibit
b. promote
c. decrease
d. stabilize
e. accentuate
a
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The cell body refers to the part of the neurons that begin at the dendrites and extend to the axon terminal.
a. true b. false
A mutant plant cell with no chloroplasts would
A) synthesize new chloroplasts in the nucleus. B) appear green in color. C) still be able to capture energy as sunlight. D) still be able to use carbohydrates as an energy source for a short period of time.
Which description of antigenic drift and antigenic shift in the influenza virus is incorrectly matched?
A) Antigenic shift: May result in a pandemic outbreak due to widespread lack of immunity. B) Antigenic drift: A host vaccinated against an influenza strain before antigenic drift may lack effective immunity and be susceptible to infection. C) Antigenic drift: Spontaneous mutation leads to a minor change in HA or NA spikes. D) Antigenic shift: Often leads to viral strains with new features such as increased infectivity or expanded host range. E) Antigenic drift: Often involves reassortment of viral strains in an animal host followed by a "species jump" to humans.
Cells carry out three major types of work; which of the following involves the synthesis of macromolecules as well as the breakdown of substances for their energy?
A. Chemical work B. Mechanical work C. Transport work D. None of the choices are correct.