There are very few of Ca dependent proteases. I am not sure kinases need metals as cofactors (activation is a different thing; that's signaling). Alkaline phosphatase needs Zn. But I guess this is not as common as the dependence of nucleases on metal ions. In any case we do use a protein inhibitor cocktail while doing extraction.
Summary. 1  Incorporation and corporation cannot be differentiated as one leads to the other. 2  While incorporation is the process, corporation is the organisation formed out of this process.
Legal Entity vs. Disregarded Entity. The biggest difference between a corporation and a partnership is who pays taxes on the business income. A corporation is considered a separate legal entity for tax purposes, which means that it must pay annual taxes on the income it receives based on the corporate tax rate. It does this by filing Form 1120 under its Employer Identification Number.