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Microbiology Lab Final Exam Version 2 Actual Exam Newest 2025-2026 Complete All Questions And Correct Detailed Answers (Verified Answers) |Already Graded A+||Brand New Version!
(FTM/Catalase)
Growth throughout the FTM tube is uniform, both the oxygen zone and non-oxygen zone have the same amount of growth. This organism doesn't have an electron transport chain instead it uses only fermentation for metabolism. This organism doesn't require the enzyme catalase to protect it from toxic forms of oxygen. This organism is negative for the catalase test.
Which of the following classifications best fits this description? - ANSWER-Aerotolerant anearobes
(FTM/Catalase)
Growth is only seen below the oxygen zone in the FTM tube. This organism doesn't utilize oxygen for its metabolism it is killed by oxygen.This doesn't have catalase. This organism is negative for the catalase test. 1 / 3
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Which of the following classifications best fits this description? - ANSWER-Obligate (strict) anaerobes
(FTM/catalase)
Growth at the top of the FTM tube only within the oxygen zone only, therefore the organism requires oxygen for growth. This organism uses an electron transport chain with oxygen as the final electron acceptor.This organism also requires the enzyme catalase to protect it from toxic forms of oxygen. This organism is positive for the catalase test.
Which of the following classifications best fits this description? - ANSWER-Obligate (strict) aerobes
(FTM/catalase)
More growth at the top of the FTM tube in the oxygen zone is seen than in the non-oxygen zone, therefore the organism can grow better in the presence of oxygen but doesn't require it for growth. This organism uses an electron transport chain with oxygen as the final electron acceptor when oxygen is present. This organism also requires the enzyme catalase to protect it from toxic forms of oxygen. This organism is positive for the catalase test.
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Which of the following classifications best fits this description? - ANSWER-Facultative anearobes
(Methyl Red)
What is the pH indicator for this test? - ANSWER-Methyl Red
(Methyl Red)
What color is the medium prior to addition of the pH indicator? - ANSWER-Yellow
(Methyl Red)
What color is the pH indicator in the dropper bottle? - ANSWER-red
(Methyl Red)
After adding two drops of pH indicator to the culture medium, what color indicates that an organism has caused a significant drop in pH of the medium (below 4.4) due to the prolific production of acids? - ANSWER-Red
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