1. Agenda 4/9 Cell Biology Review Notes
Surface area to volume calculations
Structures of eukaryotes and prokaryotes activity
Homework: Cellular organelles video and notes, me your study plan

2. Cell Theory 1. All organisms are composed of one or more cells
2. Cells are the smallest unit of life
3. All cells come from pre-existing cells
Atypical Examples
Striated Muscle-long and bigger than most cells, are multi- nucleated
Giant Algae-very large for being a unicellular organisms
Aseptate fungi-tube like structures contain many nuclei

3. Functions of Life Metabolism Growth Reproduction Homeostasis Response
Excretion
Nutrition

4. Limits to Cell Size Why are cells so small?
In cells, the surface area to volume ratio is extremely important
If you have a small surface area, and a big volume, transporting materials into and around the cell is difficult
If you have a large surface area, and small volume, cell transport becomes a lot more efficient.
Cells need a LARGE surface area to volume ratio

5. Microscopes Most cells cannot be seen with just our eyes
Two main types of microscopes
Light Microscope- inexpensive, simple to prepare specimen, magnifies up to 2000x, can observe living or dead specimens
Electron Microscope- expensive, hard to prepare specimen, magnifies up to 500,000x, specimens must be dead

6. Types of Cells Prokaryotes (Bacteria and Archaea)
Have: plasma membrane, DNA, 70s ribosome, pili, flagella, cell wall, nucleoid region
Missing: nucleus, other membrane bound organelles
Eukaryotes (Plants, Animals, Fungi)
Have: plasma membrane, DNA, 80s ribosome, nucleus, mitochondria, endoplasmic reticulum, golgi apparatus, lysosomes etc.
Some eukaryotes have a cell wall