Bacterial resistance to penicillin began to appear ____
a. several decades after its first use
b. 100 years after its first use
c. after the drug was developed from synthetic sources
d. during the AIDS outbreak in the 1980s
e. within a few years of its introduction into general use
ANSWER: e
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Which sequence reflects the locations that a secretory protein will visit on its way from its production to its secretion outside the cell?
A) rough ER, secretory vesicle, Golgi complex, ER vesicle B) rough ER, Golgi complex, smooth ER, ER vesicle C) nucleus, Golgi complex, rough or smooth ER, secretory vesicle D) smooth ER, rough ER, Golgi complex, secretory vesicle E) rough ER, ER vesicle, Golgi complex, secretory vesicle
Which glycolytic enzyme uses ATP as a substrate?
A) alcohol dehydrogenase B) phosphoglucoisomerase C) aldolase D) hexokinase E) triose phosphate isomerase
An organism suspected of being one of the Vibrio spp. grew on MacConkey agar. To determine whether it was a vibrio cell or in the Enterobacteriaceae family, an oxidase test was performed on the colony. The results of the oxidase test, however, were negative. Which one of the follow-ing statements explains this discrepancy?
a. The oxidase test should be performed on TCBS agar, not MacConkey agar. b. The oxidase test should be performed on a sheep blood agar plate to avoid false-negative results. c. The pH of the MacConkey agar is most likely elevated to alkaline conditions. d. No discrepancy is present. All vibrio cells are oxidase-negative.
In a restaurant you were served some shredded endosperm for your salad; which of the following was offered to you?
a) shredded lettuce b) shredded coconut c) shredded carrot d) shredded potato e) shredded apple