An organism's ecological role within the structure and function of a particular community is its:a
habitat.
b. trophic level.
c. population.
d. ecological niche.
e. competition.
D
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A nonprotein component of an enzyme that is usually a metal ion or small organic molecule is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
A(n) ______ infection occurs when a microbe enters a specific tissue, infects it, and remains confined there.
Fill in the blank(s) with the appropriate word(s).
The sequence in which the first species to inhabit an area are replaced by others is ____________________. Fill in the blank(s) with the appropriate word(s)
The following are steps involved in producing recombinant DNA using human DNA and a plasmid. Which one of the following answers best reflects the proper order of these steps?
1. select bacteria that contain human DNA 2. isolate and purify DNA to be recombined 3. add DNA ligase to join human DNA with plasmid 4. cut human DNA and plasmid with restriction enzyme 5. introduce new plasmid to bacteria A) 4, 1, 5, 3, 2 B) 2, 4, 3, 5, 1 C) 2, 5, 1, 3, 4 D) 4, 3, 2, 1, 5 E) 5, 1, 2, 4, 3