The key feature of metal ion catalysis is:
The presence of transition metals in the enzyme correctly identifies the characteristic feature or property described in this question. In Enzymes Basics, specific characteristics define and distinguish biological molecules, organisms, or processes from one another. The feature described by The presence of transition metals in the enzyme is a defining property that arises from its unique molecular structure, evolutionary history, or physiological role. The other options (Formation of enzyme-substrate covalent bonds, Hydrolysis of peptide bonds, and Non-specific binding of any substrate) descri
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 6
