C

CH2 OH acid

Figure 13.10 Monooxygenase activity on a straight-chain hydrocarbon.

mineralized via the standard p-oxidation pathway (Section 5.4.4). Note that the other atom from the O2 molecule is reduced to H2O.

Figure 13.11 shows five bacterial pathways for the initial steps in the biodegradation of toluene, an aromatic, naturally occurring hydrocarbon that is present in gasoline. The first four involve a monooxygenase, the fifth a dioxygenase. The first three of the

o-cresol Ch3

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