Which is not true of viruses?
A. They can exist in an intracellular or extracellular phase.
B. They infect animal and plant cells only.
C. They are acellular.
D. They can be observed with an electron microscope.
E. They replicate only inside host cells.
Answer: B
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________ (NAD+) is the most common coenzyme involved in energy metabolism.
Fill in the blank(s) with the appropriate word(s).
“Descending” is a term associated with the
a. mouth. b. esophagus. c. stomach. d. small intestine. e. large intestine.
Which plant has seeds that are the richest in protein?
A) wheat B) rice C) barley D) soybean
The first step for directly linking a microbe to a specific disease according to Koch's postulates is to
A) culture the blood or other body fluid from a diseased animal using nutrient medium. B) inject a sample of blood or other body fluid from a diseased animal into a healthy animal. C) obtain a sample of blood or other body fluid from a diseased animal. D) compare the blood of a sick animal to blood obtained from a healthy animal. E) isolate microbes from the blood of healthy animals.