Answer the following question given this paragraph: 

Many enzymes are simple proteins consisting entirely of one or more amino acid chains. Other enzymes contain a nonprotein component called a cofactor that is necessary for the enzyme’s proper functioning. There are two types of cofactors: inorganic ions [e. , zinc or Cu(I) ions] and organic molecules known as coenzymes. Most coenzymes are vitamins or are derived from vitamins.


Q: Many enzymes are simple proteins consisting entirely of one or more of these?

 Choices:

- alkali acid chains

- interaction acid chains

- proteins acid chains

- amino acid chains

A:
amino acid chains
