QUESTION 1 A useful adaptation used by many polar microbes is o a twitching moti

Question

QUESTION 1 A useful adaptation used by many polar microbes is o a twitching motility through endoliths. b. increased production of ABC transporters during winter. c.formation of an endospore to endure winter. o d. iron fixation. QUESTION 2 Clostridium difficile is a ubiquitous microbe that causes colitis, especially if antibiotic treatment has been prescribed. These infections have been successfully treated with fecal transplants from healthy individuals into patients' guts. Which of the following is the most plausible hypothesis as to how and why colitis occurs? O a. The antibiotic causes the diarrhea directly b. C. difficile is completely resistant to all antibiotics, so they have no effect. C.The antibiotic disrupts the patient's gut microbiome, which would normally regulate the C. difficile population. d.The fecal transplant contains toxins to C. difficile. QUESTION 3 Polar microbes o a.require much greater amounts of carbon than other microbial populations. O b. can never achieve exponential growth. c form interrelationships where cyanobacteria produce fixed carbon, nitrogen, and oxygen that is consumed by local heterotrophs. od. use denitrification to fix carbon. QUESTION 4 The microbiome of the gut resembles a continuous culture because o a. relative numbers of microbes are continuously maintained. b.washout occurs frequently c. identical communities are maintained in the culture. o d.there is constant flow of nutrients in and toxins out of the body

Explanation / Answer

1) c, endospore forms as an adaptation to the to environmental stress

2)c, antibiotic disrupts healthy microbiota of colon

3)c

4)d

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