What form of transport across the cell membrane does not require energy from the cell, but does require a transport protein?
A) diffusion
B) facilitated diffusion
C) active transport
D) endocytosis
B
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The Dew Point in Houston on March 3 at 6:00 a.m. is 38°F. This means that when the air temperature there reaches 38° F, at that time
A) the air will be very humid. B) dew will evaporate. C) water vapor in the atmosphere will condense. D) dew will freeze.
Which decade was the warmest on record?
A) 1930-1939 B) 1960-1969 C) 1990-1999 D) 2000-2009
North and South America connected approximately ________ years ago
A) 300,000 B) 3,000,000 C) 300,000,000 D) 3,000,000,000 E) 30,000,000,000
Where in a mammal would there be the highest concentrations of phosphorous?
a. liver and pancreas b. muscle tissues c. bones and teeth d. central nervous system e. hair and skin tissues