What is the purpose of the lac operon, and under what circumstances is it activated? Describe the structure of the lac operon, including the repressor protein, structural genes, and regulatory regions of the operon. What is the role of catabolite repression in the lac operon? 
Definitions:
Operating Profit
Revenue obtained through a company's principal business activities, before subtracting interest and taxes.
Invoice
A paper provided by the seller to the purchaser, listing the items, amounts, and confirmed pricing for goods or services rendered by the seller.
Payment Date
The specific date on which a payment is due or processed.
Cost
The amount of money required to purchase something or to produce a good or service.
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