Chapter 6 - Microbial Growth Microbiology

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What is a biofilm?

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A biofilm is a community of microorganisms that attach to surfaces and are embedded in a self-produced matrix of polymeric compounds, often forming a protective layer.

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What are mesophiles?

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Mesophiles are microorganisms that have an optimum growth temperature between 25-40°C, commonly found in moderate temperature environments.

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What is selective media?

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Selective media is a type of growth medium that suppresses the growth of certain types of bacteria while allowing others to grow, such as MacConkey agar for Gram-negative bacteria.

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What are obligate anaerobes?

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Obligate anaerobes are bacteria that cannot survive in the presence of oxygen and find it toxic.

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What is a facultative anaerobe?

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Facultative anaerobes are bacteria that can grow in both the presence and absence of oxygen, but prefer to use oxygen when available.

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What is differential media?

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Differential media is a type of growth medium that allows for the differentiation of microorganisms based on their biological characteristics.

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What is the significance of temperature in microbial growth?

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Temperature affects enzyme activity and metabolic processes in microbes, influencing their growth rates and survival.

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What are psychrophiles?

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Psychrophiles are microorganisms that thrive at very low temperatures, typically below 15°C.

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What are thermophiles?

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Thermophiles are microorganisms that grow optimally at high temperatures, usually between 45-80°C.

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What is the role of MacConkey agar in microbiology?

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MacConkey agar is used to isolate and differentiate Gram-negative bacteria, particularly enteric bacteria, by inhibiting Gram-positive bacteria.