Dispersion is
A. the ability of an individual to move.
B. the rate of movement of a population.
C. the spatial distribution of abiotic factors.
D. the spatial distribution of individuals.
E. the timing of reproduction.
D. the spatial distribution of individuals.
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Some of the intestinal symptoms elicited by pathogens such as Salmonella, Shigella, and Escherichia are due to the presence of
A) pseudomurein. B) S-layers. C) lipopolysaccharides. D) peptidoglycan.
Beginning at the synapse of a neuron, place the following events in the proper order to indicate the correct sequence of events in neuronal signaling
1. Ion channels bind the ligand and open. 2. Na+ is pumped out of the cell and the membrane potential is restored. 3. Acetylcholinesterase breaks down acetylcholine. 4. Na+ enters the cell and the membrane potential changes. 5. Acetylcholine is released into the synapse. 6. Ion channels close. A. 1, 2, 3, 4, 5, 6 B. 3, 4, 6, 1, 5, 2 C. 6, 4, 3, 1, 2, 5 D. 5, 1, 4, 3, 6, 2 E. 4, 5, 1, 2, 6, 3
A reason given by scientists as to why viruses are not considered living organisms is that
A. viruses can be frozen and still survive. B. viruses do not reproduce on their own. C. viruses are all smaller than the smallest known cells. D. viruses do not contain a nucleus. E. viruses do not contain genetic information.
When are histones phosphorylated?
What will be an ideal response?