Explain the phenomenon known as diauxic growth. Hypothesize why this type of regulation might be important for survival of a microbe in a community as well as a situation where lacking it might be advantageous
What will be an ideal response?
Answer: As an example, Escherichia coli exposed to two highly labile substrates such as glucose and lactose will preferentially use the most labile glucose substrate before lactose. Diauxie therefore explains how cells control gene expression, often as operons and regulons, to achieve the fastest growth rate. If a cell were to not have this mechanism, they might be outcompeted in the environment by other quicker growing and replicating cells. Lacking a global catabolite regulation system might be advantageous for cells occurring in a heterogenous mixture where specializing on an individual substrate provides poor growth yields.
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