The basic cell membrane structure consists of ___________ and ___________ in the animal cell of an organism.
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The Fluid Mosaic Model states that the cell membrane is like a fluid ocean of lipids (lipid bilayer) with floating icebergs of proteins (embedded proteins) that perform specific cellular functions.
Step 1: Understanding the Concept:
The cell membrane (plasma membrane) is a selectively permeable barrier that separates the interior of the cell from the external environment.
Its structural organization is best explained by the Fluid Mosaic Model proposed by Singer and Nicolson in 19 Step 2: Detailed Explanation:
According to the Fluid Mosaic Model, the cell membrane is composed of two primary structural components: Lipid Bilayer: Formed by two layers of amphipathic phospholipids.
- The hydrophobic fatty acid tails point inward, away from water, while the hydrophilic phosphate heads face the aqueous environment on the inside and outside of the cell.
- This bilayer provides the basic fluid framework of the membrane and acts as a barrier to water-soluble molecules. Embedded Proteins: These are proteins interspersed within or attached to the lipid bilayer.
- Integral (transmembrane) proteins span the entire membrane and act as transport channels or receptors.
- Peripheral proteins are loosely attached to the inner or outer surface of the membrane.
- These proteins create a "mosaic" pattern and perform vital functions such as transport, cell signaling, and structural support.
Therefore, the basic cell membrane structure consists of both the lipid bilayer and its embedded proteins. Step 3: Final Answer:
The correct option is (D).
