In the rumen, food is quickly attacked by cellulase ________.
A. enzymes produced by both the ruminant and the microbe
B. enzymes produced by microbes
C. archeons
D. enzymes produced by the ruminant
Answer: B
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Identification of the causative microbe for a diarrheal infection often requires a stool culture. The best medium for this purpose is
A. a medium containing mammalian blood to provide extra growth factors. B. a liquid medium, as the diarrhea conditions are more liquid than solid. C. a medium containing bile as a selective agent. D. a medium containing a broad-spectrum antibiotic as a selective agent. E. a general purpose medium that supports the growth of the diverse gut microbiota.
Endometriosis can lead to infertility by ____
a. preventing oocytes from forming b. preventing maturation of oocytes c. causing the formation of cysts d. causing scarring in the oviducts e. decreasing sperm viability
Which of the following terms includes the fewest species of organisms?
a. ecosystem b. community c. biosphere d. population e. class.
Which term is analogous to the word "niche"?
A. job description B. desires C. address D. needs E. properties