1. obligate anaerobes are often grown in an anaerobe jar, which completely excludes oxygen from the environment. how is the environment within a tube of fluid thioglycollate media different from that found within the anaerobe jar?
2. phenol red is another indicator commonly used to detect the presence of acid. this indicator is red above ph7 and yellow below ph of 7. what would be the appearance of e. coli (gram negative rod, lactose fermenter) and s. aureus (gram positive cocci, lactose fermenter) if neutral red in macconkey agar was replaced with phenol red?
3. hydrogen peroxide is used as an antiseptic to kill bacteria in cuts and abrasions. many of these bacteria are catalase positive, yet they are still killed by the actions of hydrogen peroxide. why does this occur?
Answers: 1
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1. obligate anaerobes are often grown in an anaerobe jar, which completely excludes oxygen from the...
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