The helical structure of protein is stabilized by ..........

Which of the following amino acids is achiral?

Which structure$(s)$ of proteins remain$(s)$ intact during the denaturation process?

Which functional groups are responsible for the formation of a zwitterion?

$A$ codon has a sequence of $\underline{A}$,and specifies a particular $\underline{B}$ that is to be incorporated into a $\underline{C}$. What are $\underline{A}, \underline{B}, \underline{C}$?
$\underline{A} \quad \underline{B} \quad \underline{C}$

Which of the following metals forms a complex with insulin?