Final answer:
The fluid mosaic model describes the plasma membrane as a dynamic structure with a variety of movable molecules, including phospholipids and proteins, making the correct answer B. Dynamic Structure with a Variety of Molecules.
Step-by-step explanation:
The fluid mosaic model is the accepted model for the structure and function of the plasma membrane. According to this model, the plasma membrane is a bilayer composed of phospholipids with embedded proteins, cholesterol, and carbohydrates. These components are not static; rather, they move around fluidly within the plane of the membrane, similar to tiles within a mosaic. This fluid character is essential for the activities of enzymes and transport molecules, as well as for allowing the cell to maintain its shape while being flexible enough to interact with its environment.
Given the options provided by the student, the correct answer is B. Dynamic Structure with a Variety of Molecules. This option best describes the fluid mosaic model as a dynamic structure, which indicates the ability of the membrane molecules to move fluidly, and with a variety of molecules, such as proteins and phospholipids that make up the 'mosaic' aspect of this model.