What is the difference between gene expression and protein expression, and how do they relate to each other in the process of cellular function?

Gene expression refers to the process by which information from a gene is used to create a functional product, such as a protein. Protein expression, on the other hand, specifically refers to the production of proteins from the genetic information encoded in genes.

In the process of cellular function, gene expression is the first step where the information in a gene is transcribed into messenger RNA (mRNA), which is then translated into a protein through protein expression. Proteins are essential for carrying out various functions in a cell, so the relationship between gene expression and protein expression is crucial for the proper functioning of cells.