The principal difference between eukaryotic and prokaryotic cells is that eukaryotic cells have
a. larger ribosomes than prokaryotic cells.
b. cell walls, while prokaryotic cells do not.
c. DNA replication and transcription in the same compartment, while prokaryotic cells do not.
d. a nucleus, while prokaryotic cells do not.
Ans: d. a nucleus, while prokaryotic cells do not.
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Which of the following does not contribute to the infectious ability of prions?
A. Prion proteins are not digested. B. Prion proteins can induce the misfolding of normal proteins. C. Prion proteins can enter the bloodstream. D. Prion proteins are deposited as aggregates. E. Prion diseases progress slowly.
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
An example of polyploidy is found in a plant
A. having an abnormal number of two or more individual chromosomes. B. having only one set of chromosomes. C. having three or more chromosomes. D. having an abnormal number of one particular chromosome. E. having three or more sets of chromosomes.
Seedless vascular plants can ____ without water, but cannot ____ without water.
A. reproduce asexually; reproduce sexually B. reproduce sexually; reproduce asexually C. grow; reproduce D. utilize phloem; utilize xylem E. utilize xylem; utilize phloem