Which of the following is a molecular disease?

The value of $x$ in compound '$D$' is $.........$.

Match the following types of proteins with their properties:

Type of Protein	Their Properties
$(A)$ Fibrous	$1$. Hydrogen bonding
$(B)$ Globular	$2$. Water soluble
	$3$. Spherical shape
	$4$. Disulphide linkage

The total number of negative charges in the tetrapeptide,$Gly-Glu-Asp-Tyr$,at $pH$ $12.5$ will be $......$ .

Given below are two statements $:$
Statement $(I):$ On hydrolysis,oligopeptides give rise to a fewer number of $\alpha$-amino acids,while proteins give rise to a large number of $\beta$-amino acids.
Statement $(II):$ Natural proteins are denatured by acids,which convert the water-soluble form of fibrous proteins to their water-insoluble form.
In the light of the above statements,choose the most appropriate answer from the options given below $:$

Which of the following is $NOT$ a globular protein?