How many statements are not true for structure of protein?

(i) The long linear protein chain is called primary structure.

(ii) The first amino acid is also called as C-terminal amino acid and the last amino acid is called the N-terminal amino acid.

(iii) A protein thread is folded in the form of a helix in secondary structure.

(iv) The long protein chain is also folded upon itself like a hollow woollen ball, giving rise to the tertiary structure.

(v) Tertiary structure is absolutely necessary for the many biological activities of proteins.

(vi) Some proteins are an assembly of more than one polypeptide or subunits and give rise to quaternary structure of a protein.