NURSING EXAM QUESTIONS
MICROBIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Above 7 pH
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Bellow 7 pH
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Between 3-5 pH
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None of the above
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Detailed explanation-1: -The term “alkaliphile” is used for microorganisms that grow optimally or very well at pH values above 9 but cannot grow or grow only slowly at the near-neutral pH value of 6.5. Alkaliphiles include prokaryotes, eukaryotes, and archaea.
Detailed explanation-2: -Bacteria are generally neutrophiles. They grow best at neutral pH close to 7.0. Acidophiles grow optimally at a pH near 3.0. Alkaliphiles are organisms that grow optimally between a pH of 8 and 10.5.
Detailed explanation-3: -Most non-extremophilic bacteria grow over a broad range of external pH values, from 5.5–9.0, and maintain a cytoplasmic pH that lies within the narrow range of pH 7.4–7.8 [1–4]. Hence, they are able to acidify or alkalinize the cytoplasm relative to the external milieu.
Detailed explanation-4: -Acidophiles have optimal growth at pH values near 3 and alkaliphiles have optimal growth at pH values above 9. At the other end of the spectrum are alkaliphiles, microorganisms that grow best at pH between 8.0 and 10.5.