Four of the five terms listed below are used to
describe a neuron cell membrane. Select the
exception.
a. gated channels
b. pumps
c. wave of depolarization
d. open channels
e. synaptic cleft
Answer: e
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Mercury Emissions by Continent. By weight, coal does not contain much mercury, but we burn a lot of it. Several industries besides coal-fired power plants contribute substantially to atmospheric mercury pollution. Figure 2.13 shows mercury emissions by industry from different regions of the world in 2006. Which industry tops the list of mercury emitters? Which industry is next on the list?
1.Dental amalgam (cremation); Waste incineration
2.Chlorine production; Cement production
3.Cement production; Metal production
4.Fossil fuel combustion; Gold production
Activation of the parasympathetic nervous system
a. causes the pupils of the eye to constrict. b. decreases heart rate. c. decreases glandular secretions. d. contracts sphincters. e. increases the flow of thick saliva.
Which of the following pairs is correctly matched?
a. middle lamella?cellulose b. integrins?receptors c. primary cell wall?pectin d. fibronectins?wood e. secondary cell wall?glycoproteins
When Pfr absorbs far-red light, the Pfr is converted to Pr. Indicate whether the statement is true or false