Which Of The Following Techniques Exemplifies Phenotypic Rescue In A Host Cell?

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Which Of The Following Techniques Exemplifies Phenotypic Rescue In A Host Cell?

A. Introducing a genomic library from a cell that produces a particular gene product into a mutant host cell auxotroph that cannot synthesize the product. B. Introducing a genomic library from a mutant cell auxotroph for a particular gene product into a host cell that can synthesize that product constitutively. C. Removing genes that encode a particular gene product from a cell that expresses that product constitutively before creating a genomic library. D. Replacing a mutant gene with a functional gene in a DNA library from an auxotrophic mutant cell prior to introducing the library into a related host cell.
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A. Introducing a genomic library from a cell that produces a particular gene product into a mutant host cell auxotroph that cannot synthesize the product.
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