After obtaining DNA fragments by PCR, the
fragments are
a. separated by a centrifuge.
b. viewed under a microscope.
c. separated by an electric current.
d. inserted into a plasmid.
e. chopped up using restriction enzymes
C
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A proton pump is needed in the lysosomal membrane because:
A. the interior of the lysosome needs to be acidic. B. protons are being moved from low to high concentration. C. protons cannot move across a membrane on their own. D. All of the answer options are correct.
Viruses can ________ only after they have entered a host cell, and only by using the host's cellular machinery.
Fill in the blank(s) with the appropriate word(s).
The loss of genetic information no longer needed for an intracellular existence by an obligate parasite is called genomic ________ .
Fill in the blank(s) with the appropriate word(s).
In Tilman's experiments with diatoms, what was the outcome when the two species competed for silica?
A) Both coexisted. B) Both survived several years but one eventually won out. C) One outcompeted the other to extinction. D) Both died.