The basis of most estuarine food webs is:
a. anaerobic bacteria
b. primary production.
c. pseudofeces.
d. detritus.
d
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The nitrogen cycle on land begins with ____
a. nitrification b. denitrification c. decomposition d. uptake by producers e. nitrogen fixation
When the cell is NOT sending signals, the electrical difference between the inside and outside of a neuronal membrane is specifically referred to as the
A. graded potential. B. action potential. C. reversal potential. D. membrane potential. E. resting potential.
The use of a brief electrical shock to introduce DNA into bacterial cells is called ________
A) gene therapy B) electroporation C) electrophoresis D) electrocution E) chromatography
Leaf thickness represents a trade-off between _____
A) light collection and carbon dioxide absorption B) water retention and carbon dioxide absorption C) water retention and oxygen absorption D) light collection and oxygen absorption