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Answer» Differences between Inducible and Repressible Operon | Inducible Operon | Repressible Operon | | 1. It involves the switching on of an operon which normally remains turned off. | 1. It involves turning off of an operon which normally remains switched on. | | 2. It is switched on in response to a new substrate which is to be handled and metabolised. | 2. Repressible operon is stopped by increased formation or availability of a metabolite. | | 3. It is generally connected with a catabolic pathway. | 3. It is mostly connected with an anabolic pathway. | 4. The regulator gene of an operon produces a repressor that blocks the operator gene.
| 4. The regulator gene of an operon, produces a the repressor called aporepressor. The same cannot block the operator gene. | | 5. It involves the removal of the repressor of an operon by the inducer metabolite | 5. It involves the blocking of the operator gene of operon through a complex repressor that is formed union of aporepressor formed by regulator gene corepressor which is actually a product of anabolic pathway | 6. In this inducer is substrate, hormone or its by product.
| 6. In this repressor is a compound formed by an aporepressor and a corepressor which is commonly an end product of metabolic pathway. | | 7. It brings about transcription and translation. | 7. Repression stops transcription and translation. |
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