Cell Types

Phospholipids

Lipid Bilayer

Fluid Mosaic Model

Membrane Proteins

Membrane Protein Functions

Transport Across Membranes Small Molecules Simple Diffusion Facilitated Diffusion Active Transport Large Molecules Pinocytosis Phagocytosis Receptor-mediated endocytosis sugars amino acids nucleotides proteins viruses bacteria endocytosis exocytosis -

Diffusion Molecules move from areas of high concentrations to areas of low concentrations.

Diffusion Molecules move from areas of high concentrations to areas of low concentrations.

Simple Diffusion  Requires no energy  Requires no proteins  From high to low concentrations  Small, hydrophobic molecules O 2, CO 2, steroids

Simple Diffusion

Facilitated Diffusion  Requires no energy  Requires a carrier protein  From high to low concentrations

Facilitated Transport Molecules move across a membrane through carrier proteins from high to low concentrations.

Active Transport  Requires energy  Requires transport proteins  From low to high concentrations  Small, hydrophobic molecules

Active Transport

Transport Across Membranes Small Molecules Simple Diffusion Facilitated Diffusion Active Transport Large Molecules Pinocytosis Phagocytosis Receptor-mediated endocytosis sugars amino acids nucleotides proteins viruses bacteria endocytosis exocytosis -

Endocytosis / Exocytosis Phagocytosis Pinocytosis Receptor-mediated endocytosis

Endocytosis Phagocytosis

Endocytosis Phagocytosis

Amoebazoa -- Amoeba Endocytosis Phagocytosis

Endocytosis Pinocytosis

Endocytosis Pinoocytosis

Endocytosis Receptor-mediated Endocytosis

Endocytosis Receptor-mediated Endocytosis

Endocytosis Receptor-mediated Endocytosis

Endocytosis

Exocytosis

Endocytosis

Movement of Molecule Into and Out of a Cell Small Molecules Simple Diffusion Facilitated Diffusion Active Transport Large Molecules Pinocytosis Phagocytosis Receptor-mediated endocytosis sugars amino acids nucleotides proteins viruses bacteria endocytosis exocytosis &

Osmosis

Cell – Cell Junction Desomosomes = Adhesion Junctions

Cell-to-Cell Junctions desmosomes

Cell – Cell Junction Tight Junctions = Sealing Junctions

Cell-to-Cell Junctions tight junctions

Cell – Cell Junction Gap Junctions = Communication Junctions

Cell – Cell Junction

Cell Walls