Which of the following is a major source of protein?

Find the correct option for the sequence given below:
$(1)$ Alanine $\rightarrow$ Valine
$(2)$ Asparagine $\rightarrow$ . . . . . .
$(3)$ Aspartic acid $\rightarrow$ Glutamic acid
$(4)$ Arginine $\rightarrow$ Histidine

Identify the $X$ figure.

The compound,which gives a positive ninhydrin test and a negative Benedict's solution test,is

Assertion: Human diet should compulsorily contain glycine,serine,and tyrosine.
Reason: Essential amino acids cannot be synthesized in the human body.

Which of the following are the most diverse molecules in the cell?