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There are two bacterial strains, A and B.
Case 1) Cell growth of ¡°A¡± is enhanced when ¡°B¡± is coexisted in the culture.
Case 2) ¡°A¡± cannot grow when ¡°B¡± is coexisted in the culture.
Describe every possible molecular mechanism in each case.


Most enzyme reactions are reversible.  However, different enzymes usually catalyze a degradation pathway and a synthetic pathway, such as Glycolysis and Glyconeogenesis.  Why?
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