The $\alpha$-helix structure is found in which of the following?

The cell membrane is primarily composed of ...........

Define the following terms related to proteins: $(i)$ Peptide linkage,$(ii)$ Primary structure,$(iii)$ Denaturation.

Identify the essential amino acids from below $:$
$(A)$ Valine
$(B)$ Proline
$(C)$ Lysine
$(D)$ Threonine
$(E)$ Tyrosine
Choose the correct answer from the options given below $:$

Which of the following molecules is capable of forming a Zwitter ion?

The total number of amino acids present in insulin is