As we try to define life, we believe that O2, which
is so pervasive in the...
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Biology
As we try to define life, we believe that O2, whichis so pervasive in the environment, is fundamentally necessary tosustain life.  Clostridium &Streptococcus are both catalase-negative bacteria, butonly Streptococcus grows by fermentation. Why then isClostridium killed by O2, whereasStreptococcus is not?
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Answer Both clostridium and streptococcusare anaerobes but clostridium is strictly anobligate anaerobe while streptococcus isa facultative anaerobeEXPLANATION Anaerobic microorganisms unlike aerobic microorganismsdoesntrequires oxygen for growthDepending on the oxygen requirement related to growth microbesare classified into Obligate
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