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Using the FDA rating system, which of the following categories of contraception has the lowest failure rate?
Regulatory Sequences
Segments of DNA that are involved in controlling the activity of genes, including when, where, and how much of a gene product is made.
Constitutive
Expressed continuously under normal physiological conditions, not subject to regulation by environmental conditions.
Lac Operon
A set of genes involved in the metabolism of lactose in bacteria, along with their promoter and operator sequences that control their expression.
Repressor Protein
A type of protein that binds to specific DNA sequences and inhibits the expression of a gene by blocking RNA polymerase.
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