Cell Membrane: Historical Perspective and Basic Structure
Overview of the discovery and initial understanding of the cell membrane's structure.
What is Cell Membrane: Historical Perspective and Basic Structure?
The selectively permeable outer boundary of the cytoplasm of a cell, composed of a lipid bilayer with embedded proteins.
Key points
- Trace the historical development of understanding the cell membrane's structure.
- Describe the basic structural components of the cell membrane.
- Explain the key features of the fluid mosaic model.
Common exam trap
Confusing the cell membrane with the cell wall (present only in plants, fungi, bacteria).
Definitions
- Term
Plasma Membrane
- Meaning
The selectively permeable outer boundary of the cytoplasm of a cell, composed of a lipid bilayer with embedded proteins.
- Term
Phospholipid Bilayer
- Meaning
A double layer of phospholipid molecules, forming the basic structure of cell membranes, with hydrophobic tails facing inward and hydrophilic heads facing outward.
- Term
Fluid Mosaic Model
- Meaning
A model describing the structure of cell membranes as a fluid phospholipid bilayer with various proteins embedded in or attached to it, allowing for movement and diverse functions.
Learning objectives
Trace the historical development of understanding the cell membrane's structure.
Describe the basic structural components of the cell membrane.
Explain the key features of the fluid mosaic model.
Prerequisites
Basic understanding of cell structure.
Knowledge of biomolecules (lipids, proteins).
Common mistakes
Confusing the cell membrane with the cell wall (present only in plants, fungi, bacteria).
Assuming a static, rigid structure for the cell membrane.
Not differentiating between the historical models and the current fluid mosaic model.
Keywords
Cell Membrane
Plasma Membrane
Fluid Mosaic Model
Phospholipid Bilayer
Singer and Nicolson
Selective Permeability
Lipids
Proteins
Practice preview
The early experiments by Gorter and Grendel in 1925 suggested that the cell membrane is composed of:…
easy
Which of the following scientists is credited with coining the term 'cell membrane'?…
easy
The Davson-Danielli model, proposed in 1935, described the cell membrane as:…
medium