To study the promoter of a gene,a researcher should use a cDNA library.

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To study the promoter of a gene, a researcher should use a genomic library, not a cDNA library. A genomic library contains fragments of the entire genome of an organism, including the promoter regions of genes, while a cDNA library only contains copies of messenger RNA (mRNA) that have been reverse transcribed into DNA. Therefore, a genomic library is necessary for studying the promoter regions of genes.

To Study the Promoter of a Gene,a Researcher Should Use