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A student claims that the lac operon is an example of a mechanism that an organism uses to conserve energy. Evaluate the validity of the student's claim. The claim is invalid because the lac operon requires a bacterial cell to produce extra regulatory proteins and regulatory segments of DNA. The claim is valid because the lac operon allows a bacterial cell to shut down a metabolic pathway if it is not immediately needed. The claim is valid because the lac operon allows a bacterial cell to maintain constant levels of enzymes even when they are not immediately needed. The claim is invalid because the lac operon requires a bacterial cell to constantly produce the lac repressor protein even when lactose is not present.
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