Which of the following is true of the receptors for steroid hormones?
A) They are hydrophobic.
B) They are proteins.
C) both a and b
D) neither a nor b
B
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In the free-market system, economic decisions are made primarily by
A. the government B. the United Nations C. individuals D. the stars
At the start of the Triassic, most of the continents were above sea level, and sediments from that time are often red because ________
A) the dry climate baked clays to form hornfels B) there are extensive dune fields C) they contain extensive deposits of iron ore D) they include iron oxides E) they are a major source of uranium and red quartz
Water vapor is nearly absent in ________
A) the upper reaches of the atmosphere B) the lower reaches of the atmosphere C) the troposphere D) the atmosphere over sea surfaces E) the atmosphere over land surfaces
When Nellie is suspended at rest by a pair of gymnastic rings, the upward support forces by the rings will always
A. each be equal to her weight. B. add up to more than her weight. C. each be half her weight. D. add up to equal her weight.