Which of the following statements best describes the fluid mosaic model of the plasma membrane:

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The question asks us to identify which statement best describes the fluid mosaic model of the plasma membrane.
Option 1: 'A lipid bilayer with protein molecules dispersed within it' — This is the correct description. The fluid mosaic model envisions a phospholipid bilayer that forms the basic fabric of the membrane, with a variety of proteins embedded or dispersed within it, giving a mosaic-like pattern. The lipids provide a fluid, dynamic environment, while proteins float or be embedded in this sea of lipids.
Option 2: 'A single layer of proteins with lipid molecules dispersed within it' — Inaccurate because the membrane is a phospholipid bilayer, not a single layer of proteins. Lipids form the bilayer, and proteins are embedded within or attached to it, not the other way around.
Option 3: 'A protein bilayer sandwiching a layer of lipids' — This reverses the actual organization; there is no 'protein bilayer' sandwiched around lipids. The membrane is a lipid bilayer with proteins interspersed, not a protein layer surrounding lipids.
Option 4: 'A single layer of proteins surrounding a single layer of lipids' — The membrane is not a single protein layer; it is a bilayer of lipids with proteins embedded in it. Describing it as a single layer of proteins around lipids misrepresents the structural arrangement.
Option 5: 'A single layer of lipids surrounding a layer of proteins' — While lipids are fundamental to the bilayer, the concept of a single lipid layer surrounding a protein layer is incorrect. The model describes a bilayer (two lipid layers) with proteins embedded within, not a single lipid layer enveloping proteins.

Dashboard TEST 1 2025 T3

Which of the following statements best describes the fluid mosaic model of the plasma membrane:

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