| 1. | They are secreted as proenzymes and require extracellular activation.
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| 2. | These are secreted in an inactive form called ( termed zymogens or proenzymes ).
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| 3. | This type of inactive precursor to an enzyme is known as a zymogen or proenzyme.
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| 4. | Enzyme precursors are called zymogens or proenzymes.
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| 5. | There is currently no other known modifications necessary to activate the proenzyme and enable catalytic activity.
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| 6. | In both cases inactive proenzymes such as hemocyanin, tyrosinase, and catcholoxidase must be activated first.
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| 7. | Most MMP's are secreted as inactive proenzymes which are activated when cleaved by extracellular proteinases.
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| 8. | Caspases exist as inactive proenzymes composed of a prodomain, a large protease Fas and various apoptotic stimuli.
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| 9. | When these proenzymes reach the lumen of the tract, a factor specific to a particular proenzyme will activate it.
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| 10. | When these proenzymes reach the lumen of the tract, a factor specific to a particular proenzyme will activate it.
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