The trace metal iron is required for photosynthesis, in certain nitrogen fixation enzymes, and in the structure of
proteins.
a. True
b. False
True
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When the distance between a pair of charges is reduced to half, the electric force between them
A. quadruples. B. is half. C. is reduced by one-quarter. D. doubles.
The need to open its doors to immigrants from Asia and other non-European countries seems to have had what effect on Australia?
A. Racial intolerance and hate crimes have increased. B. White Australians seem to be increasingly comfortable with their multiethnic country. C. Trade relations with Europe and North America have strengthened. D. Aborigines have been moving further into the Outback.
Which of the following is NOT a main type of silicate structure?
A. sheets B. frameworks C. double chains D. triple chains E. single chains
What does the price of a product or service reflect?
A. that if a person does not want the product, then the price is too high B. the fair market value C. the demand for and availability of the product D. the highest amount the seller can get for the product