According to the fluid mosaic model, the plasma membrane is composed of which of the following?

Explanation

The fluid mosaic model describes the plasma membrane as a dynamic structure consisting of a phospholipid bilayer with proteins scattered throughout in a mosaic-like pattern. Phospholipids provide the foundational bilayer, allowing for fluidity and selective permeability. Intrinsic proteins are embedded within this bilayer, facilitating transport and signaling, while extrinsic proteins are attached to the membrane surface, contributing to signaling and structural support. Thus, the correct answer, 'All of these,' acknowledges the integral roles of phospholipids, intrinsic proteins, and extrinsic proteins in forming the plasma membrane. Options A, B, and C are incorrect individually because they only represent partial aspects of the model.