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Genetic regulatory networks consist of molecular regulators that interact with each other and with other substances in the cell.

These networks control the production of
Select Option genesmRNAsugar
inside the cell. For example, a yeast cell placed into a solution containing lactose would upregulate the expression of genes leading to the production of the enzyme
Select Option lactasegalactosegalactase
, allowing the yeast cell to use the sugar as an energy source.
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