A particular neuron does not release neurotransmitters into the synaptic cleft. Further investigation shows that this cell does not respond to calcium ions that are necessary for t- and v-SNARE complex interaction. The most likely problem is associated with the function of
A) synaptic boutons.
B) acetylcholinesterase.
C) synaptotagmin.
D) GABA receptors.
E) calcium ions.
C) synaptotagmin.
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Most enveloped viruses use the host ________ membrane as their envelope source.
A. mitochondrial B. plasma C. nuclear D. none of these
A mutation in the gene encoding the enzyme that cuts F factor DNA during conjugation would result in
A. an inability to separate the recipient DNA from the donor DNA. B. an inability to draw the conjugated cells close enough to allow DNA transfer. C. the transfer of single-stranded DNA instead of double-stranded DNA. D. the inability of the donor DNA to move through the pilus. E. the inability of the recipient cell to replicate the F factor after transfer.
Our knowledge of existing species is limited and
biased toward __________. Fill in the blank(s) with the appropriate word(s).
During treatment of water to make it potable, about 90% of the microbes are removed
A) by preliminary fermentation. B) in the sedimentation step. C) by treatment with biosensors. D) by treatment with chlorine or ozone. E) in the filtration step.