Multiple Choice
The fluid mosaic model of the membrane proposed that membranes:
6. The Membrane
Biological Membranes
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Consider the currently accepted fluid mosaic model of the plasma membrane. Where in the plasma membrane would cholesterol most likely be found?
A
On the outside (external) surface of the membrane
B
On the inside (cytoplasmic) surface
C
In the interior and on the inside surface but not on the outside surface
D
On either surface of the membrane but not in the interior of the membrane
E
In the interior of the membrane
Verified step by step guidance1
Understand the fluid mosaic model: The plasma membrane is described by the fluid mosaic model, which suggests that the membrane is a flexible layer made of lipid molecules interspersed with proteins. This model highlights the dynamic and fluid nature of the membrane.
Identify the components of the plasma membrane: The main components include phospholipids, proteins, carbohydrates, and cholesterol. Phospholipids form a bilayer, with hydrophilic heads facing outward and hydrophobic tails facing inward.
Determine the role of cholesterol: Cholesterol is a lipid molecule that is interspersed within the phospholipid bilayer. It plays a crucial role in modulating the fluidity and stability of the membrane.
Locate cholesterol in the membrane: Cholesterol is found within the interior of the phospholipid bilayer. It is positioned between the phospholipid molecules, interacting with the hydrophobic tails.
Conclude the location of cholesterol: Based on its role and position, cholesterol is most likely found in the interior of the membrane, where it helps maintain membrane fluidity and integrity.
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Biological Membranes practice set
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