Which of the following contains the highest percentage of protein?

Match List-$I$ with List-$II$.

List-$I$ (Natural amino acid)	List-$II$ (Code)
$A$. Glutamic acid	$I$. $Q$
$B$. Glutamine	$II$. $W$
$C$. Tyrosine	$III$. $E$
$D$. Tryptophan	$IV$. $Y$

Which of the following metals forms a complex with insulin?

$A$ peptide synthesized by the reactions of one molecule each of Glycine,Leucine,Aspartic acid and Histidine will have ..... peptide linkages.

Which is the $C$-terminal residue in glycyl alanine?

The correct statements are:
$A$. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis.
$B$. During denaturation,secondary and tertiary structures of a protein are destroyed but primary structure remains intact.
$C$. Nucleotides are joined together by phosphodiester linkage between $C_{3}$ and $C_{5}$ carbons of the pentose sugar.
$D$. Quaternary structure of proteins represents the spatial arrangement of two or more polypeptide chains.
Choose the correct answer from the options given below: