Use the figure to answer the question. 
The figure shows a simple metabolic pathway. According to Beadle and Tatum's hypothesis, how many genes are necessary for this pathway?
Definitions:
Production and Sales Process
The combined sequence of operations involved in manufacturing goods and selling them to customers.
Days Sales Outstanding (DSO)
A measure of the number of days that it takes to collect on accounts receivable.
Accounts Receivable
Money owed to the company for goods or services provided and billed to a customer.
Accounts Payable
Money owed by a business to its suppliers.
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