What is the method called that indicates the
age of material by measuring the content of the
radioisotope and the daughter elements?
a. radiometric dating
b. carbon dating
c. catastrophism
d. all of these
e. none of these
B
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In reabsorption
a. plasma proteins are returned to the blood. b. excess hydrogen ions are removed from the blood. c. excess water is passed on to the urine. d. nutrients and ions are selectively returned to the blood. e. drugs and foreign substances are passed into the urine.
Pine pollen is primarily disseminated by:
a. birds. b. wind. c. water. d. beetles. e. moths.
Biologists sometimes divide living organisms into two groups: autotrophs and heterotrophs. These two groups differ in _____
A) their sources of energy B) their electron acceptors C) their mode of nutrition D) the way that they generate ATP
Membrane proteins serve many functions. One of the functions is transportation of substances across the membrane. If a cell biologist placed cells into an environment in which a chemical has been added that blocks the function of only carrier proteins, the process that will be affected is
A. phagocytosis. B. simple diffusion. C. osmosis. D. pinocytosis. E. active transport.