These are responsible for cell shape, internal organization, and movements
a. ribosomes
b. cytoskeleton
c. vesicles
d. Golgi bodies
e. endoplasmic reticulum
B
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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
Carbohydrates normally function in animals as
A) energy-storage molecules. B) the functional units of lipids. C) sites of protein synthesis. D) enzymes in the regulation of metabolic processes. E) a component of triglycerides.
The photosynthetic membranes of the green sulfur bacteria are called ________.
A. chloroplasts B. chlorocytes C. chlorosomes D. chlorophylls
In which period did the number of species increase most rapidly?
a. 0 to 20 years b. 20 to 40 years c. 40 to 60 years d. 60 to 100 years e. 100 to 160 years