MIC201' Lecture

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MIC201. Lecture 4 Outline Cell membranes
Structure and functions
The cytoplasmic membrane structure Chemical
composition of membranes. Unit membranes. Other
features of the cytoplasmic membrane
Proteins. Fluid mosaic model. Archaeal
membranes. The cytoplasmic membrane functions.
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MIC201. Lecture 4 Outline Cell membranes
Structure and functions
The cytoplasmic membrane is a thin structure that
completely surrounds the cell and it is a real
barrier that separates the inside of the cell
from the environment.
The cytoplasmic membrane structure
Thin structure (about 8 nm thick).
Chemical composition of membranes.
Phospholipid bilayer.
What is a phospholipid? What happens to
phospholipids in aqueous environments?
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Single unit membrane
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Unit membranes.
Phospholipid bilayer and proteins embedded.
Other features of the cytoplasmic membrane
Proteins.
Embedded proteins. Periplasmic proteins. Periphera
l membrane proteins
Fluid mosaic model. Archaeal membranes.
Strengthening agents that stabilize membranes in
Prokaryotes and Eukaryotes.
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Diagram of the structure of the cytoplasmic
membrane
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Membrane structure in Archaea. (c) Lipid bilayer.
(d) Lipid monolayer.
Remember Ether linkages instead of ester
linkages.
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The cytoplasmic membrane functions.