What is a polypeptide chain of amino acids called?

Which of the following statement$(s)$ is/are true?
$(i)$ All amino acids contain one chiral centre.
$(ii)$ Some amino acids contain one, while some contain more chiral centres or even no chiral centre.
$(iii)$ All amino acids in proteins have $L$-configuration.
$(iv)$ All amino acids found in proteins have $1^{\circ}$ amino group.

Which of the following is not an amino acid?

Which of the following statements correctly describe the functions of proteins?
$(I)$ As an enzyme
$(II)$ As a hormone
$(III)$ Fight against infectious organisms
$(IV)$ Formation of genetic material

Which of the following tests is not used for testing of proteins?

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: