The following figure shows the graph of revenue function 
and cost function 
. What is the relationship between marginal cost and marginal revenue when profit is at its maximum value? 
Definitions:
Lactose Operon
A set of genes and their regulatory sequences involved in the metabolism of lactose in bacteria, demonstrating control of gene expression.
Promoter Regions
Specific DNA sequences where RNA polymerase binds to initiate transcription of genes.
Operator
In genetics, a segment of DNA to which a repressor binds, controlling the expression of genes; in mathematics, a function or symbol that represents a function from a set of numbers.
Polyadenylation
That part of eukaryotic mRNA processing in which multiple adenine-containing nucleotides (a poly-A tail) are added to the 3' end of the molecule.
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