Which of the following plates would have the highest percentage of bacteria that are expected to produce insulin?
(A) I only
(B) III only
(C) IV only
(D I and III
Ans: (C) IV only
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The absence of atmospheric oxygen probably made life possible because oxygen ________
a. forms free radicals that degrade compounds by extracting electrons from their bonds b. would have favored the development of early predators and suppressed life's first efforts c. is a greenhouse gas that would have made the Earth too hot for life d. prevents the formation of liquid water
The type of microscope that directs a beam of electrons back and forth across a specimen thinly coated
with metal is a a. compound light microscope. b. stereoscope. c. transmission electron microscope. d. scanning electron microscope. e. scanning tunneling microscope.
The main purpose of genetic screening is to
A.) look for the genes that cause every kind of cancer. B.) assess the risk of having or carrying a genetic disorder. C.) prevent carriers from ever passing on genetic disorders. D.) identify every possible genetic defect in a given person.
Which of the following viral types enter animal cells via fusion with the animal cell membrane?
A. non enveloped viruses B. naked viruses C. enveloped viruses D. All of these choices are correct.