Which statement about chemical or electrical synapses is true?
a. Electrical synapses require a neurotransmitter.
b. In electrical synapses, presynaptic and postsynaptic neurons are separated by synaptic clefts.
c. Electrical synapses store excess ions in synaptic vesicles.
d. In chemical synapses, presynaptic and postsynaptic neurons are connected by a protein channel.
e. Electrical synapses involve the transfer of ions from presynaptic to postsynaptic neurons
e
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Considering the evolution of Bacteria, the criteria used for taxonomy, and the genetic requirements for individual metabolic pathways,
explain how it is unlikely to observe three genera of the same family where one genus has strict anaerobes that degrade only small aromatics, another genus degrades large molecular weight sugars aerobically, and a third is a photoautotroph. What will be an ideal response?
The most abundant group of seedless tracheophyte plants are the
A. club mosses. B. horse tails. C. angiosperms. D. ferns. E. gymnosperms.
A graduate student is researching the spread of mosquito vectors and dengue fever into the southern United States. She has collected a substantial amount of data regarding the locations where the vector has been detected as well as the incidence of the dengue fever virus in both the vector population and in humans. What application would enable her to effectively illustrate patterns of vector and disease spread?
A. Geographic Information Systems B. DNA microarrays C. Remote sensing D. DNA fingerprinting
A human population living without medical care in a developing country would probably have ____
a. a rectangle-shaped age structure diagram b. an r value < 0 c. a pyramid-shaped age structure diagram d. per capita birth and death rates consistent with those of a stage 4 society e. no density-dependent factors operating