During transformation, cells ____
a. take up pieces of DNA that are released as other cells disintegrate
b. take up pieces of DNA through a viral infection
c. replicate DNA molecules
d. make replicate copies of one another
e. generate their own DNA
ANSWER: a
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The Ug99 strain of wheat stem rust _____
a. has been eradicated worldwide b. has wiped out most of the wheat around the world c. is unable to infect most wheat varieties d. can infect wheat varieties that were previously resistant to other strains e. is only a problem in the United States
Animals apparently evolved:a
in freshwater. b. in the ocean. c. during the Cambrian explosion. d. in swamps. e. during the Devonian.
Each of the following cell junctions is found in intestinal epithelial cells except
A) gap junctions. B) hemidesmosomes. C) tight junctions. D) desmosomes. E) All are found in intestinal epithelial cells.
Most myxobacteria ________.
A. produce desiccation resistant dormant myxospores B. are micropredators because they secrete digestive enzymes that lyse bacteria and yeasts C. have the ability to aggregate and form a fruiting body under conditions of nutrient limitation D. All of the choices are correct.