The enzymes that are required to break down arabinose will b

The enzymes that are required to break down arabinose will be produced after ___ binds to the araC protein, causing araC to change its shape and stimulate transcription

Question 5 options:

Solution

Choice C is correct.

Reason: AraC represents the main switch and operator centre for the arabinose operon. When arabinor is present in the system, a complex of araC and arabinose is formed. This complex is necessary for identification and binding of RNA polymerase on the operator. As this complex is identified the RNA polymerase, the ara cistron undergoes transcription. Further, activation of this araC and arabinose complex recruits cyclic AMP in the system and further intensifies the binding of RNA polymerase to the cistron. Together, these complex systems bring about transcription of arabinose operon.