NURSING EXAM QUESTIONS
MICROBIOLOGY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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mesophiles
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psychrophiles
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thermophiles
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neutrophiles
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Detailed explanation-1: -These microbes are called psychrophiles, which means “cold-loving” in Greek. Psychrophiles are largely bacteria but can also include other microbes [1]. Microbes cannot survive in solid ice.
Detailed explanation-2: -Psychrophiles or cryophiles (adj. cryophilic) are extremophilic organisms that are capable of growth and reproduction in cold temperatures, ranging from −15°C to +10°C. Temperatures as low as −15°C are found in pockets of very salty water (brine) surrounded by sea ice.
Detailed explanation-3: -The optimum growth temperature required for psychrophiles to grow and reproduce is below 15°C whereas for psychrotrophs it ranges from 20°C to 25°C. Psychrophilic microorganisms inhabits in the cold regions of the Earth including polar zones, high mountains, glaciers, and deep oceans.
Detailed explanation-4: -Psychrophilic bacteria are defined as cold-loving bacteria. Specifically, their cardinal temperatures are 20 °C for maximal growth, 15 °C or lower for optimal growth, and 0 °C or lower for minimum growth (Morita, 1975), and this definition is accepted by most microbiologists.