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Question
Biology
Posted about 2 months ago
What is the purpose of using a 24 hour culture and  7day culture of the same bacterial species?
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Answer from Sia
Posted about 2 months ago
Answer
The purpose of using a 24-hour culture and a 7-day culture of the same bacterial species is to observe and compare different growth phases and physiological states of the bacteria.
Solution
a
Growth Phases: A 24-hour culture typically represents bacteria in the exponential (log) phase, where they are actively dividing and growing rapidly. In contrast, a 7-day culture is likely in the stationary or death phase, where growth has slowed or stopped due to nutrient depletion and waste accumulation
b
Metabolic Activity: The metabolic activity of bacteria can vary significantly between these phases. A 24-hour culture will have high metabolic activity, while a 7-day culture may show reduced metabolic activity and increased production of secondary metabolites
c
Stress Responses: Studying both cultures allows researchers to understand how bacteria respond to different environmental stresses over time, such as nutrient limitation and waste accumulation
Key Concept
Bacterial Growth Phases
Explanation
Bacteria go through distinct growth phases: lag, log (exponential), stationary, and death. A 24-hour culture is usually in the log phase, while a 7-day culture is in the stationary or death phase. This helps in studying different physiological states and responses to environmental changes.

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