The regulatory sequence of a gene is the portion of DNA that

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The regulatory sequence of a gene contains the various elements that determine when, where, and how much of a protein is produced. It can turn a gene on or off, thereby determining whether the protein is made or not. It also determines the level of expression of the gene, which can vary depending on the type of cell or tissue in which it is expressed. Therefore, all of the above options are correct.

The Regulatory Sequence of a Gene Is the Portion of DNA