If a restriction endonuclease cuts a linear DNA three times, how many fragments should there be after

the DNA is subjected to electrophoresis through an agarose gel?



a. 1
b. 2
c. 3
d. 4
e. 5


D

Biology & Microbiology

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Variation is usually introduced by the process of _________?

a. random fertilization

b. mutation

c. random mating

d. recombination between homologous chromosomes during meiosis

e. all of the above

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An aquifer is most closely related to ____

a. sea water b. lake water c. stream water d. glacial water e. groundwater

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Cells surrounded by plasma membranes and no cell wall need to maintain a certain cell volume because an influx of water would cause the cell to explode. In order to reduce cell volume, these cells increase the activity of their sodium-potassium pumps.

a. true b. false

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What molecule is the body’s main energy source?

a. oxygen b. carbon dioxide c. glucose d. fats e. proteins

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