Viroids are of economic significance because they cause disease in

A. humans.
B. animals.
C. plants.
D. All of the choices are correct.


Answer: C

Biology & Microbiology

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Before insulin from recombinant DNA became available, diabetics were treated with insulin derived from cadavers

a. True b. False Indicate whether the statement is true or false

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with metal is a a. compound light microscope. b. stereoscope. c. transmission electron microscope. d. scanning electron microscope. e. scanning tunneling microscope.

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A) minerals B) lipids C) proteins D) carbohydrates

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Yersinia pestis

A. was virulent in the Middle Ages but is no longer virulent. B. has humans as an endemic reservoir. C. does not respond to antimicrobic drugs. D. is usually transmitted by a flea vector. E. All of the choices are correct.

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