Continental drift affects
1.climate.
2.extent of glaciations.
3.sea levels.
4.evolution.
5.All of the choices are correct.
5
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The major inhibitory neurotransmitter of the human brain is _____
A) acetylcholine B) epinephrine C) glutamate D) nitric oxide E) gamma-aminobutyric acid (GABA)
Most North American outbreaks of Cyclospora cayetanensis have been associated with
A. cattle. B. iguanas. C. imported leafy vegetables and berries. D. chickens.
When acetylcholine stimulates the opening of ligand-gated ion channels on a postsynaptic cell, what is this event called?
A. neuromuscular junction B. temporal summation C. inhibitory postsynaptic potential (IPSP) D. excitatory postsynaptic potential (EPSP) E. synaptic integration
Figure 4.16
What is a main function of the structure in the accompanying figure labeled B?
A. It controls cell shape. B. It separates DNA during cell division. C. It helps nerve cells lengthen. D. It is found in hair. E. It helps regulate DNA replication.