Spatial summation is characterized by:
a. several presynaptic neurons releasing neurotransmitter simultaneously.
b. several presynaptic neurons releasing neurotransmitter in a sequential pattern.
c. several postsynaptic neurons receive sequential inputs from several presynaptic neurons.
d. a single presynaptic neuron firing multiple times in rapid succession.
e. a single presynaptic neuron directly contacting several postsynaptic neurons.
a
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Viruses can be divided into seven basic classes. This classification is determined by:
A. nucleic acid of genome. B. type of host infected. C. cellular location of infection. D. presence of nuclear DNA. E. virus size.
The five-year survival rate of ____________________ cancer is only 13%
Fill in the blank(s) with correct word
Fossil evidence of animal life dates back
__________ years. a. 125 million b. 350 million c. 570 million d. 900 million e. 1.8 billion
In E. coli cells, when lactose is absent from the environment,
A. no b-galactosidase, lactose permease, andgalactosidetransacetylas are made. B. polycistronic mRNA levels would be very high. C. trace amounts of b-galactosidase, lactose permease, and galactosidetransacetylase are made. D. the lac operon is induced. E. large amounts of b-galactosidase, lactose permease, and galactosidetransacetylase are made.