Phospholipids Hydrophobic (H20 fearing) tails point inward,
mingling together & shielded from water.
In the lipid bilayer are diverse proteins floating in a phospholipid
Plasma Membranes job as a “traffic cop”.
Regulates the flow going into and out of the cell.
o Nonpolar molecules (O 2& CO ) easily move across membrane
Some membrane proteins form channels, which shield ions &
polar molecules as passing through hydrophobic centre of
Other proteins serve as pumps, using energy to actively
transport molecules into and out of cell.
Section 4.3 – Prokaryotic cells are structurally simpler than eukaryotic
Bacteria & Archaea consist of Prokaryotic Cells.
Protists, Fungi, Plats & Animals consist of Eukaryotic Cells.
Eukaryotic cells have a membrane-enclosed nucleus (Houses most of
Eukaryote means true nucleus (Greek).
Prokaryote means before nucleus. Prokaryotic cells evolved before
Prokaryotic cells are structurally simpler then Eukaryotic cells.