44) Suppose you are given a blood agar plate and notice that the microbe plate h

Question

44) Suppose you are given a blood agar plate and notice that the microbe plate has a distinct green halo around it. What type of hemolysis is this? 45) "Human metabolism is supported by bacterial metabolism". What does this mean? 46) I want to study the functionality of the gut microbiome so I dissect the cecum of an animal under the hood. I collect stool but several bacterial species die instantaneously in the process. Why? 47) Thinking of the epidemiology lab, suppose none of the plates showed the red Serratia, but did show growth of the yellow Micrococcus. What could possibly explain this? 48) What compound was used to limit the presence of oxygen in the oxygen environmental factor lab?

Explanation / Answer

44) Microbe plate has distinct green halo means the type of hemolysis is Alpha-hemolysis (-hemolysis). It is a partial or “green” hemolysis associated with reduction of red cell hemoglobin.

45) Many bacteria are present inside human body. Bacterial pathogens have evolved to exploit humans as a rich source of nutrients to support survival and replication. Gut bacterial metabolism contribute to human metabolic diseases. It serves to detoxify many toxic xenobiotics and protect or suppress the harmful effects of the xenobiotic metabolites on human.

46) Bacteria and enzymes in the cecum of these animals cause fermentation that breaks down cellulose fibers. These are facultatively anaerobic and strictly anaerobic bacteria so die outside the cecum while dissecting.

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