Multiple Choice
Keeping in mind that unsaturated fatty acids form kinks in the phospholipid tails, what would happen if all of the unsaturated fatty acids in a lipid bilayer were replaced with saturated fatty acids?
23. Lipids
Cell Membranes
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Which one of the following components of a cell membrane extends through its entire thickness?
A
Cholesterol
B
Peripheral proteins
C
Integral protein
D
Sphingomyelin
Verified step by step guidance1
Understand the structure of the cell membrane: The cell membrane is primarily composed of a phospholipid bilayer, which provides a semi-permeable barrier between the cell's interior and exterior environments.
Identify the types of proteins associated with the cell membrane: There are two main types of proteins in the cell membrane - integral proteins and peripheral proteins.
Define integral proteins: Integral proteins are embedded within the phospholipid bilayer and typically span the entire thickness of the membrane, allowing them to interact with both the interior and exterior of the cell.
Define peripheral proteins: Peripheral proteins are located on the surface of the cell membrane and do not extend through the bilayer. They are often attached to integral proteins or the polar heads of phospholipids.
Recognize the role of cholesterol and sphingomyelin: Cholesterol is interspersed within the phospholipid bilayer, providing fluidity and stability, while sphingomyelin is a type of phospholipid found in the outer leaflet of the bilayer, contributing to membrane structure but not spanning its entire thickness.
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