In the United States, what fraction of fresh

water taken from the environment is used to
irrigate agricultural fields?
a. 0.
b. 20.
c. 40.
d. 60.
e. 80


E

Biology & Microbiology

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What is the fundamental unit of all substances?

a. Atom b. Cell c. Organ d. Tissue e. Community

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The movement of NH4

+ ions into a cell down an electrochemical gradient (where, when compared to the outside of the cell, the inside of the cell has less NH4 + ions) is best described as an example of

a. symport. b. passive diffusion. c. antiport. d. facilitated diffusion. e. active transport.

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Answer the following questions true (T) or false (F)

1. Different parts of the tongue are responsive to different tastes. 2. The cilia that respond to sounds in the cochlea have "trapdoor" channels for K+ ions. 3. Our visual system creates images as well as perceiving them.

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The identification of an unknown bacterial isolate is based on (Check all that apply)

a. Gram stain morphology b. number of bacteria c. source of the bacteria d. results of standard biochemical tests e. preexisting morphological and biochemical data collected for a large number of previously identified bacterial species

Biology & Microbiology