All of the members of the same species occupying the same area at the same time constitute a(n):
a. individual
b. population
c. community
d. ecosystem
e. biosphere
b
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Using a host defective in proteases is likely to be necessary when engineering
A) a complete metabolic pathway requiring several different enzymes. B) overproducing proteins. C) production of a small protein. D) transgenic animals with immune systems.
In streams and rivers, most of the microbial biomass is ________.
A. metabolically inactive B. floating on the surface C. buried in bottom sediments D. attached to surfaces
The meaning that a brain assigns to a sensory stimulus is known as:
a. perception b. sensation c. adaptation d. excitation e. interpretation
__________ are electrically excitable cells that signal other cells by means of chemical messages. Fill in the blank(s) with the appropriate word(s)