1. …..as units of Life. Ch. 7.1 A View of the Cell
CELLS
…..as units of Life.
Ch. 7.1 A View of the Cell

2. History
1665-Robert Hooke viewed thin slices of cork under a crude microscope and observed time hollow boxes. He called these boxes cells.

3. History cont.
1674- Anton van Leeuwenhoek observed tiny living organisms in drops of pond water.

4. WHAT DO WE MEAN BY:
STRUCTURE ?
FUNCTION ?

5. CELLS
Basic units of:
Structure and
Function
of all living things.

6. STRUCTURE= HOW IT IS BUILT/CONSTRUCTED.
FUNCTION= WHAT IT DOES, HOW IT WORKS.

7. History of the Cell Theory
1838- Matthias Schleiden concludes that all plants are made up of cells.

8. History of the Cell Theory
1839-Theodor Schwann concludes that all animals are made up of cells.

9. History of the Cell Theory
1855-Rudolph Virchow completes the cell theory by proposing all cells come from existing cells.

10. The Cell Theory:
All organisms are composed of one or more cells
The cell is the basic unit of organization for the organism
All cells come from pre-exiting cells

11. Two basic cell types: Prokaryotic & Eukayotic
Prokaryotic cells
Earliest cells
Lack membrane bound organelles
No nucleus
No mitochondria
Have membrane, cytoplasm, free DNA, ribosomes

12. An Organelle Is:
A minute structure within a plant or animal cell that has a particular job or function.

13. Prokayrotic cells: Bacteria

15. Eukaryotic cells: May have evolved from Prokaryotic
Have a nucleus that holds the DNA inside a membrane
Have mitochondria
Also have cell membrane & cytoplasm

16. Nucleus
Mitochondria
ANIMAL PLANT

17. Human muscle cells
With large nuclei

18. Human muscle cells
With large nuclei

19. Eukaryotic Cells: are found in animals like Paramecium
Nucleus
With DNA
For reproduction

20. The power house of the cell:
Mitochondria = where energy is released
The power house of the cell:
Has a membrane like
The nucleus
ATP

21. Exception:
A Eukaryotic Cell
With NO NUCLEUS !

25. What are some differences between animal and plant cells?
ANIMAL PLANT

26. Organelles found only in Plants:
Cell Walls
Cellulose
Chloroplasts

27. Plant Cell
Chloroplast= absorbs light, changes light energy into chemical energy for photosynthesis = GREEN
Cell Wall= forms rigid outer structure, made of cellulose (fiber)
Cellulose = carbohydrate found in cell walls

28. Cell wall
Chloroplast
Large
vacuole
PLANT CELL

29. Both plants & protists have: chloroplasts cell walls cellulose
Plant cells
Both plants & protists have:
chloroplasts cell walls cellulose
Diatoms

30. No Wall,
Just a Cell
Membrane
Animal Cell

31. Organelles found only in Animal cells:
Centrioles = involved in cell division

32. Found in both Plant and Animal Cells
Organelles that surround cells for support:
Cytoskeleton =
gives structure to a cell
Cell Membrane= Semi-permeable,
controls what enters and leaves the cell, outer containment envelope.