Specifically, what does it mean that an amino
acid or a fatty acid is essential?
a. it is needed in large amounts by the body
b. the body cannot survive without it
c. the body cannot synthesize it
d. it is an essential component of digestive
enzymes
e. more than one of these describes what it
means to be essential
C
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Which of the following is not normally considered a pathogenic species of Clostridium?
A. C. perfringens B. C. tetani C. C. acetobutylicum D. C. botulinum
A notable exception to this evolutionary adaptation is the lack of any flying species within the
A. insects. B. amphibians. C. birds. D. reptiles. E. mammals.
Archaea that have been cultured in the laboratory include ____
a. Crenarchaeota and Euryarchaeota b. Crenarchaeota and Korarchaeota c. Euryarchaeota and Korarchaeota d. Euryarchaeota and Nanorarchaeota e. Nanoarchaeota and Korarchaeota
Which of these are major causes of diarrhea?
A) infection of the lower intestinal tract B) infection of the upper intestinal tract C) hormonal stimulation D) nervous stimulation