Multiple Choice
In an animal cell, where is the cell (plasma) membrane located?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
Which of the following best describes the structure and function of the cell membrane (plasma membrane) in most cells?
A
A rigid, impermeable cellulose layer that prevents any substance from entering or leaving the cell
B
A fluid mosaic lipid bilayer with embedded proteins that forms a selectively permeable barrier
C
A protein-only shell that encloses the cytoplasm and provides structural support
D
A single layer of phospholipids with hydrophilic tails facing inward and hydrophobic heads facing outward
Verified step by step guidance1
Understand that the cell membrane, also known as the plasma membrane, is a critical structure that surrounds the cell and controls what enters and leaves.
Recall that the cell membrane is primarily composed of a lipid bilayer, which means two layers of phospholipids arranged with hydrophilic (water-attracting) heads facing outward and hydrophobic (water-repelling) tails facing inward.
Recognize that this lipid bilayer is not rigid but fluid, allowing proteins and lipids to move laterally within the layer, which is why it is called a 'fluid mosaic model'.
Identify that embedded proteins within the membrane serve various functions such as transport, signaling, and structural support, contributing to the membrane's selective permeability.
Conclude that the best description of the cell membrane is a fluid mosaic lipid bilayer with embedded proteins that forms a selectively permeable barrier, allowing the cell to maintain homeostasis.
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