Epithelial tissue is least likely to:
a. contract.
b. be specialized as sensory receptors.
c. provide protection.
d. regulate exchange of substances between parts of the body.
e. produce and secrete cell products
a
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San Francisco Bay was created by:
a. rising sea levels. b. retreating fjords. c. erosion of the coastline. d. tectonic activity. e. glaciers.
What type of plants flower only if day length is less than a critical value?
A) short-day plants B) long-day plants C) biennial plants D) perennial plants
What event triggers the release of neurotransmitters?
a. Calcium induces the fusion of synaptic vesicles with the presynaptic membrane. b. Sodium induces the fusion of synaptic vesicles with the presynaptic membrane. c. Potassium induces the fusion of synaptic vesicles with the presynaptic membrane. d. Calcium activates enzymes that degrade synaptic vesicles. e. Sodium activates enzymes that degrade synaptic vesicles.
An antimicrobial's therapeutic index is
A) The drug level required for clinical treatment of an infection B) The drug level at which the agent becomes too toxic for the host C) The ratio of the toxic dose to the therapeutic dose D) The level of effectiveness in a population