1. Unit 3: Cells
7.1: Life is cellular

2. Inner life of a cell

3. What is a cell? Discovery of the Cell Basic unit of life
Robert Hooke used a compound microscope to observe cork
Basic unit of life
Matthias Schleiden – 1838
All plants are made of cells
Theodor Schwann- 1839
All animals were made of cells
Rudolf Virchow- 1855
New cells can be produced only from the division of existing cells

4. The wacky history of cell theory

5. Cell theory 1. All living things are composed or cells.
2. cells are the basic unit of structure and function in living things.
3. new cells are produced from existing cells.

6. Cell Diversity Size Shape Internal Organization
Limited by surface to volume ratio
If the cell is too large decreases cell function
Shape
Determined by function
Ex: nerve, skin, white blood cell
Internal Organization
Contain a variety of organelles
Eukaryotes contain membrane bound nucleus
Prokaryotes do not contain membrane bound nucleus

7. Types of cells Two characteristics all cells share
Surrounded by a barrier – Cell Membrane
Contain DNA

8. Prokaryotes Smaller and simpler than eukaryotic cells
Have genetic material that is not contained in a nucleus
Carry out every activity associated with living things
Grow
Reproduce
Respond to environment

9. EUKARYOTES Generally larger and more complex than prokaryotic cells
Contain membrane bound organelles
Contain a nucleus in which their genetic material is separated from rest of cell
Examples
Unicellular organisms
Plants
Animals
Fungi
Protists

10. Eukaryote
Plants
Animals

11. What’s the difference Animal Plant Cell membrane Organelles
Cytoplasm
Mitochondria
Ribosomes
Endoplasmic reticulum
Golgi Apparatus
Lysosome
Cytoskeleton
Cilia and Flagella
Nucleus
Has the organelles like the animal cell
Cell wall
Contains cellulose
Support and protects cell
Vacuoles
Fluid filled
Store enzymes and metabolic wastes
Plastids
Store starch or fats
Contain pigments