Foundations-Cells-4

From CellBiology

Plasma Membrane


This lecture is also an introduction to cell compartments and describes the structure of membranes forming these compartments.


Draft - this online lecture is currently in 2018 draft status. This notice removed when completed.
Cells and Membranes: 1 Cells and sizes | 2 Prokaryotes | 3 Viruses and prions | 4 Plasma membrane | 5 Compartments | 6 Membrane structure | 7 Membrane specialisations | Foundations - Moodle

Terms

Biological Levels

Cells can be "broken down" into smaller and smaller constituent "parts"
  1. Whole cell
  2. Organelles - nucleus, mitochondria, endoplasmic reticulum, Golgi
  3. Components - membrane, channels, receptors
  4. Biological polymers - DNA, RNA, Protein, sugars, cellulose (chains of molecules, consisting of monomer subunits)
  5. Organic molecules - nucleotides, amino acids, carbohydrate (monomer subunits)
Membrane compartments.jpg

Typical cell membrane bound compartments

Eukaryotic Cell Organelles

  • Fundamental concept - all eukaryotic cells (some specialized exceptions)
  • Membrane bound (enclosed) - specialized part of a cell that has its own particular function
  • membranes form "compartments" within the cell that allow specialisation of metabolism and function.

Plasma Membrane Images

The cell membrane (plasma membrane or plasmalemma) encloses or covers all cell types and is 7 nanometers thick (1000 times smaller than the RBC).

Here are some different ways of looking microscopically at membranes.

CellB35x10L2.jpg Eo104le.jpg

Light Micrograph

Red White Blood cells 01.jpg Mycobacterium tuberculosis bacteria.jpg

Scanning Electron Micrograph

Plasma and Organelle Membranes CDCcandida.jpg

Transmission Electron Micrograph


Links: Membrane Images | RBC membrane | Serial Scanning Electron Microscopy


Draft - this online lecture is currently in 2018 draft status. This notice removed when completed.
Cells and Membranes: 1 Cells and sizes | 2 Prokaryotes | 3 Viruses and prions | 4 Plasma membrane | 5 Compartments | 6 Membrane structure | 7 Membrane specialisations | Foundations - Moodle