Which statement best describes the stationary phase of microbial growth?

Which statement best describes the stationary phase of microbial growth?

• A. Viable cell count increases rapidly as nutrients are abundant.
• B. The total number of viable cells remains constant and metabolic activity slows due to waste buildup and nutrient depletion.
• C. Cells die off due to toxin buildup.
• D. Metabolic activity increases while the population grows exponentially.

Answer: (B)

During the stationary phase, resources become limited and waste products accumulate, causing the rate of new cell production to balance the rate of cell death. The result is that the number of viable cells stays roughly constant over time. Metabolic activity often slows and shifts toward maintenance and stress responses as cells cope with the unfavorable conditions. This is why the statement that the viable cell count remains constant and metabolism slows due to depleted nutrients and accumulating waste best describes the stationary phase. In contrast, exponential growth occurs with abundant nutrients and high metabolic activity, and the death phase follows when death outpaces birth and viability declines.

During the stationary phase, resources become limited and waste products accumulate, causing the rate of new cell production to balance the rate of cell death. The result is that the number of viable cells stays roughly constant over time. Metabolic activity often slows and shifts toward maintenance and stress responses as cells cope with the unfavorable conditions. This is why the statement that the viable cell count remains constant and metabolism slows due to depleted nutrients and accumulating waste best describes the stationary phase. In contrast, exponential growth occurs with abundant nutrients and high metabolic activity, and the death phase follows when death outpaces birth and viability declines.