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Transcript of Chapter 4. Section 1 Schleiden concluded: 1838 - All plants were composed of cells Schwann...
Cell Structure and Function
Chapter 4
History of Cell Biology
Section 1
Hooke microscope
Leeuwenhoek microscope
The cork “little boxes”
19th century scientists
Schleiden concluded: 1838 - All plants were composed of cells
Schwann concluded: 1839 - All animals were composed of cells
Virchow concluded: 1855 - All cells come from other cells
The Cell Theory
1. All living organisms are composed
of at least 1 or more cells
2. Cells are the basic unit of life
3. Cells only come from pre-existing
cells
Introduction to Cells
Section 2
Cell Diversity
Diversity of cell shape
bacterial cell shapes
algal cell shapes
Diversity of cell size
10-9 10-6 10-3
Comparison of some cell sizes
Limits to cell sizeSurface Area : Volume ratio
Best ratio is a big number
Big Number = Surface AreaVolume
Two Kinds of Cells
Comparing Size
Prokaryotes “before kernal /nucleus”
Very primitive cell
Have no true nucleus
DNA is organized in a
region- nucleoid
The bacteria are our
prokaryotes
Eukaryotes “true kernal /nucleus”
Advanced cells
DNA in a nucleus
surrounded
by a membrane
Most organelles have
membranes
All other cells
How cells are organized
Many organisms remain single-celled
How cells are organized
Some organisms have organized into colonies
How cells are organized
Many organisms are multi-celled
Cell tasks for multi-celled organisms
Multi-celled organisms with cell group tasks:
The simplest group of performing cells - tissues
Groups of performing tissues – organs
Groups of performing organs – organ systems
Groups of performing organ systems – organisms
Cells - tissues – organs – organ systems -
organisms
Cell Organelles
Section 3
The animal cell
Plasma Membrane
Fluid Mosaic model
Nucleus
Mitochondria
Ribosomes
Endoplasmic Reticulum - rough
Endoplasmic reticulum - smooth
Golgi apparatus
Vesicles
Cytoskeleton
Cilia
Flagella
Unique Features of Plant Cells
Section 4
Plant Cells
Cell Structure and Function
End - - Chapter 4