Which one of the following was described in the video as being a 'hallmark' of being a catalyst?

Question

BlackTom AI · Accepted Answer

In addressing the concept from the video, let's evaluate what each option implies about catalysis.
Option 1: 'Being reusable' – This aligns with the hallmark of catalytic behavior: a catalyst participates in a reaction to increase rate but is not consumed in the overall process, allowing it to catalyze many cycles. The video highlighting 'hallmark' likely emphasized this repeated use as a defining feature.
Option 2: 'Being made out of protein' – While many biological catalysts (enzymes) are proteins, being proteinaceous is not a universal hallmark of catalysis itself. Some catalysts are RNA (ribozymes) or inorganic materials, and the essential property is the ability to accelerate the reaction, not the material type.
Option 3: 'Having two substrates' – Having two substrates is characteristic of certain enzyme-catalyzed reactions (bimolecular interactions) but is not a universal hallmark of catalysis. A catalyst can act on a single substrate in some cases or involve more complex mechanisms with multiple substrates; the hallmark remains its ability to be regenerated and reused.
Option 4: 'Having a metal cofactor' – Many enzymes use metal cofactors, but many catalyze reactions without metals (e.g., organic cofactors, or metal-free active sites). Therefore, possessing a metal cofactor is not a universal hallmark of catalysis itself and would not reliably identify a catalyst's defining feature.

Considering these points, the concept described as the hallmark emphasizes the catalyst’s repetitive, non-consumptive role in facilitating multiple reaction cycles, which most directly points to 'Being reusable' as the core characteristic.

Which one of the following was described in the video as being a 'hallmark' of being a catalyst?

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