1. Cell (plasma) Membrane
Lipid bilayer: hydrophobic fatty acid tails, hydrophilic phosphate heads
Peripheral proteins; loosely bound, easily removed with salt treatment
Integral proteins; buried in the bilayer, membrane must be destroyed to free
-may span the membrane, can have receptor or signaling attachment, cell -cell

2. Membranes are “Mosaic” and fluid
Protein positions in the membrane are NOT static. Proteins float about in the lipid bilayer
Artistic – representation of how the membrane arrangement varies with time (shift caused by a cellular event?)

3. Organelles Nucleus Nuclear envelope- double membrane enclosure
Nucleolus – a darken area where ribosomes are synthesized
Nuclear pore – large holes in the membranes that allow the exit of macromolecules (RNAs)
Chromatin –DNA in its functioning state – being read, directing cellular acts

4. In the cytoplasm Ribosomes – 2 types – site of protein synthesis
Complex of RNA and protein
1st type – free floating in the cytoplasm, and make free floating proteins
2nd type – membrane bound (endoplasmic reticulum) synthesizes membrane bound proteins (integral proteins)