Which of the following proteins is insoluble in any solvent?

Given below are two statements.
Statement $I$ - Most of the blood proteins are acidic proteins.
Statement $II$ - Derived proteins are not found in nature.
In the light of above statements,select the correct option given below:

Schematically represent primary, secondary and tertiary structures of a hypothetical polymer, for example, a protein.

Which of the following is an example of a conjugated protein?

Primary proteins are also called as polypeptides because:

Which amino acid has an imidazole ring?