In India, which age structure category holds the least number of individuals?
a. pre-reproductive
b. early reproductive
c. late reproductive
d. early post-reproductive
e. late post-reproductive
ANSWER: e
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If a bacterium carrying a plasmid that confers resistance to ampicillin is placed into medium without ampicillin, it may
A) gain resistance to other antibiotics. B) transfer resistance to other cultures in the laboratory. C) undergo a reversion mutation. D) lose the plasmid because there is no selection for ampicillin resistance.
When assembling a fish aquarium one must add a conditioner to the water that contains bacteria capable of metabolizing fish waste such as ammonia, nitrate, and nitrite that accumulates in the aquaria water. Which of the following components of signal reception and transduction is NOT required for the bacterial two-component regulatory system for metabolizing these nitrogenous waste products?
A. NarQ receptor B. NarL transcriptional activator C. a protein kinase D. metabolic enzymes E. ligand-gated calcium channel
The negatively charged phosphates of ATP influence one another by
A) relative hydration. B) charge repulsion. C) resonance hybridization. D) dehydrogenation. E) all of the above
The primary mechanism whereby cytotoxic T cells are able to destroy infected cells involves
A) activation of the complement system. B) the incorporation of perforins into the cell membrane. C) phagocytosis. D) incorporation of the major attack complex. E) enzymatic degradation