5 Questions
What is the composition of a phospholipid?
Glycerol, two fatty acid tails, and a phosphate-linked head group
Who proposed that the plasma membrane is composed of a phospholipid bilayer?
E. Gorter and F. Grendel
What is the role of cholesterol in the cell membrane?
It is found alongside phospholipids in the membrane
What is the term used for the arrangement of phospholipids in the cell membrane?
Phospholipid bilayer
Who suggested that the plasma membrane must be a phospholipid?
Charles Overton
Study Notes
Phospholipid Structure
- A phospholipid consists of a hydrophilic (water-loving) head and a hydrophobic (water-fearing) tail.
- The hydrophilic head contains a phosphate group, while the hydrophobic tail consists of two fatty acid chains.
Cell Membrane Composition
- The plasma membrane is composed of a phospholipid bilayer.
- This was proposed by Singer and Nicolson in 1972.
Cholesterol's Role in the Cell Membrane
- Cholesterol is present in the cell membrane, where it helps maintain fluidity and stability.
Phospholipid Arrangement
- The arrangement of phospholipids in the cell membrane is known as a lipid bilayer.
- In this arrangement, the hydrophilic heads face outward, while the hydrophobic tails face inward.
Historical Significance
- Gorter and Grendel suggested in 1925 that the plasma membrane must be a phospholipid.
Test your knowledge of the cell membrane structure with this quiz. Explore the composition, functions, and essential components of the double layer of lipids and proteins that surrounds a cell.
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