NURSING EXAM QUESTIONS
MICROBIOLOGY
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Question
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Some members of the domain Archaea are considered hyperthermophiles. The optimum temperature range for these hyperthermophiles would be:
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-15oC to 0oC
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30oC to 40oC
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5oC to 20oC
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90oC to 100oC
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Explanation:
Detailed explanation-1: -From these studies, the highest optimal growth temperature for an organism is 105–106 °C (Table 1). The heterotrophic archaea Hyperthermus butylicus and Pyrodictium abyssi have maximum growth temperatures of 108 and 110 °C, respectively.
Detailed explanation-2: -Hyperthermophiles are primarily archaea and growth optimally at 80°C or above, being unable to grow below 60°C (47). The hyperthermophiles are now well characterised taxonomically at the DNA-DNA hybridisation level, and their evolutionary relatedness has been examined.
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