The permeases are

What is true about the fluid-mosaic model of the cell membrane?

Which of the following is a selectively permeable membrane?

What is the cell membrane composed of?

Assertion $(S)$: The plasma membrane and organelle membranes are composed of phospholipids.
Reason $(R)$: The structural component of cellular organelles is lipid.

The most accepted Fluid Mosaic Model describes the cell membrane as a quasi-fluid structure where lipids and integral proteins are arranged in a mosaic pattern. In recent years,this model has been refined. Which of the following statements is incorrect regarding this model?