In bacteria, the expression of genes whose products are involved in related processes are regulated by a simple mechanism. This gene cluster, along with its promoter and all other sequences, is called an operon.
When arabinose is present and glucose is absent,
A. the ara operon will be turned on by positive control
B. the ara operon will be turned on by negative control
C. the ara operon will be turned off by positive control
D. the ara operon will be turned off by negative control
E. the ara operon will first turn on then turn off
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