Which phase is characterized by a balance between cell production and cell death?

Which phase is characterized by a balance between cell production and cell death?

• A. Lag phase
• B. Stationary phase
• C. Log phase
• D. Death phase

Answer: (B)

In batch culture, growth proceeds through distinct phases. The phase where the population size remains stable because the rate of new cell production matches the rate of cell death is the stationary phase. This balance happens when nutrients become limited and waste products accumulate, causing cells to slow or stop dividing while some die from starvation or stress. Some cells may enter a non-dividing or dormant state, but overall the number of living cells stays roughly constant. The other phases differ: during the lag phase there’s little division as cells acclimate; during the log phase cells divide rapidly with net production outpacing death; during the death phase more cells die than are produced due to severe resource depletion and toxic buildup.

In batch culture, growth proceeds through distinct phases. The phase where the population size remains stable because the rate of new cell production matches the rate of cell death is the stationary phase. This balance happens when nutrients become limited and waste products accumulate, causing cells to slow or stop dividing while some die from starvation or stress. Some cells may enter a non-dividing or dormant state, but overall the number of living cells stays roughly constant. The other phases differ: during the lag phase there’s little division as cells acclimate; during the log phase cells divide rapidly with net production outpacing death; during the death phase more cells die than are produced due to severe resource depletion and toxic buildup.