Section 1, Chapter 3
Cells

Cells

Major Parts of a Cell
Nucleus
Cell Membrane
Cytoplasm
Cytosol = fluid
Organelles

Cell Membrane

Phospholipid Bilayer
Polar region
(hydrophilic)
Nonpolar region
(hydrophobic)

Phospholipid Bilayer

Cholesterol= rigid rings of hydrocarbons

Contributes to the nonpolar nature of membrane

Stabilizes the cell membrane

Increases rigidity of cell membrane

Membrane Proteins

Membrane Proteins

Membrane Proteins

CAM Protein

1. Nuclear Envelope
2. Nucleolus
3. Chromatin

Nucleolus “little nucleus”

Dense body of RNA & Proteins

Produces Ribosomes

Chromatin “Colored substance”
Chromosome “colored body”
Condenses into chromosomes during mitosis
DNA wrapped around histone proteins

End of Section 1, Chapter 3