| 1. | The trp operon is active only when cellular tryptophan is scarce.
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| 2. | It is encoded by the lacY gene in the lac operon.
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| 3. | The lugdunin genes are located on a 30-kbp operon.
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| 4. | As in prokaryotes, genes in chloroplast DNA are organized into operons.
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| 5. | Operon regulation can be either negative or positive by induction or repression.
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| 6. | In lac-operon, there are three structural genes:
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| 7. | The lactose operon is one example of an inducible system.
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| 8. | Attenuation is a second mechanism of negative feedback in the trp operon.
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| 9. | RNA polymerase is free to continue transcribing the entire operon.
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| 10. | Trp operon encodes enzymes responsible for the synthesis of tryptophan.
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