BIOL 4090 Chapter : Chapter 3 Homework
Document Summary
13. 92 generations x 1. 5 generations per hour = 19. 94 hours. During environmental cultures the lag phase is longer more than likely due to a low initial population number. Log phase in batch cultures are periods of exponential growth with rapid doubling. In the environment overall growth rates are much slower than batch rates and the exponential growth is very quick depending on the substrate available. Stationary phase is when there is no net growth. During batch cultures stationary phase indicates there is a shortage of nutrients in the substrate and there can be now new cell growth. For the environmental culture this is a very short period where the cells go dormant and await a new addition of substrate. Death phase in a controlled batch system is characterized by a net loss of cells due to a lack of required nutrients or a buildup of toxic by-products.
