The reason for differences in the sets of proteins expressed in a nerve and a pancreatic cell of the same individual is that nerve and pancreatic cells contain different .

The question is incomplete as it does not have the option which are:

A) genes

B) regulatory sequences

C) sets of regulatory proteins

D) promoters

C) sets of regulatory proteins

Explanation:

The pancreatic cells and the nerves are the two type of cells which perform two different functions in the cell. Although these two cells perform a different function they possess the same sequence of genetic material.

The differences in the functions are since these cells synthesize different proteins in the cell. These two different proteins are formed due to the expression of different genes in the cells. These two different gene expressions are controlled by another class of proteins called the regulatory proteins.

These regulatory proteins also called transcription factors binds to the specific part of the DNA and enhance the protein formation. Since the two cells express different regulatory proteins, therefore, perform different functions.

Thus, Option-C is correct.