A cell moves sodium ions against its concentration gradient. This is an example of ____
a. active transport
b. osmosis
c. diffusion
d. facilitated diffusionc
e. diffusion through a channel
ANSWER: a
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Countries engage in trade because
a. the exchange is mutually beneficial. b. governments force industries to exchange. c. international law dictates that exchange must take place. d. All of these.
One would expect that conflicts between parents and offspring over parental investment would be the most pronounced in ________
A) fish B) amphibians C) reptiles D) birds
How would you expect the root system of a plant grown by hydroponics to compare to the root system of a plant grown in soil?
A) absent B) less developed C) more developed D) the same
The function of a mordant in staining procedures is to
A) fix the specimen to the slide. B) provide contrasting color. C) decrease the solubility of dye molecules. D) remove dye from certain structures. E) damage cellular structures so they take up dyes better.