Refer to the table showing several prokaryote (bacterial) species (labeled A-E) that have been sequenced, along with the findings of the genes they contain.(Note: "x" marks the species possessing a functional copy of the gene.) Gene 1 is essential for the synthesis of several amino acids.Gene 2 encodes a protein involved in strengthening the cell wall.Gene 3 produces an enzyme that breaks down methane.The functions of the other five genes are currently unknown. 
Which gene is most likely to be part of the prokaryotic minimal genome?
Definitions:
Common Stock
A type of equity ownership in a corporation, representing claims on a portion of its earnings and assets, with voting rights on corporate matters.
Investing Activities
Transactions involving the purchase and sale of long-term assets and other investments, not including inventory, reported in the cash flow statement.
Financing Activities
Transactions that result in changes in the size and composition of the equity capital or borrowings of the entity.
Common Stock
Equity securities representing ownership in a company, entitling holders to vote on corporate matters and receive dividends.
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