27 proteins in the cell membrane that assists with facilitated diffusion are known as carrier proteins, or transport proteins, since they carry materials across the cell membrane.
An operational definition is used to define the terms of a process which is needed to determine the nature of an item such or its properties such as quantity, chemical composition, etc.
The degree of operationalization vary.
Operational definitions can be defined as labels and concepts in the way they are measured.
For example: The operational definition of weight can be like this:
How many pennies are needed to balance the weight of something.
When we hang something from a spring, how much a spring streches.
