Understanding the Structure of a Biological Membrane

What best represents the structure of a biological membrane according to the fluid mosaic model?

a) A rigid and static structure

b) A uniform and symmetrical composition

c) A dynamic mosaic of lipids and proteins

d) A single-layered arrangement of phospholipids

Answer:

The correct representation of the structure of a biological membrane according to the fluid mosaic model is a dynamic mosaic of lipids and proteins.

According to the fluid mosaic model, the structure of a biological membrane is best represented by a dynamic mosaic of lipids and proteins. This model proposes that the plasma membrane is a complex and flexible structure with a mosaic-like composition, consisting of various components such as phospholipids, cholesterol, proteins, and carbohydrates. These components are not static; rather, they have the ability to flow and change positions within the membrane while maintaining the overall integrity of the membrane, resulting in its fluid character.

The fluid mosaic model highlights the dynamic nature of biological membranes, where lipids and proteins move freely within the bilayer. Lipids create a fluid matrix for the membrane, while proteins are embedded within or attached to the lipid bilayer, contributing to various functions such as transport, signaling, and cell recognition.

This dynamic and flexible nature of the biological membrane allows for essential cellular processes to occur, such as the selective permeability of molecules, cell signaling, and maintaining cell structure. Understanding the fluid mosaic model is crucial in grasping the fundamental structure and function of biological membranes in living organisms.