Which of the following is one of the four main
types of tissues?
a. bone
b. muscle
c. cartilage
d. blood
e. more than one of these
B
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Pelagic organisms live:
a. in the water column. b. on the sediment. c. in the sediment. d. in hydrothermal vents. e. close to shore.
How do greenhouse gases cause climate warming?
A. Solar energy is absorbed by greenhouse gases in the upper atmosphere and re-emitted toward the earth's surface as heat, causing the climate to warm. B. Greenhouse gases block solar energy from entering the lower level of the atmosphere. C. Greenhouse gases prevent radiation of infrared energy back into space, trapping the heat near the earth's surface and causing the climate to warm. D. Infrared energy from space is absorbed by greenhouse gases in the upper atmosphere, which then re-emit the heat toward the surface of the earth, causing the climate to warm. E. Greenhouse gases absorb solar energy and re-emit it into space before it can reach the earth's surface.
An antibiotic is given repeatedly to treat a recurrent ear infection. It worked initially but now is no longer effective. This indicates that the Streptococcus bacterium
A) is very sensitive to the antibiotic. B) is being treated with an antibiotic that has experienced a manufacturing error, making it infective. C) is infectious only if it is sensitive to the antibiotic. D) experienced natural selection that has allowed the resistant Streptococcus to survive and multiply.
Of all the possible amino acids, all living organisms make use of only the same 20 amino acids. This supports the idea that
A) only a limited number of DNA mutations are possible. B) bacteria, animals, and plants developed independently. C) natural selection drives evolution. D) only 20 amino acids exist on Earth. E) all living things are derived from a single common ancestor.