1. Bellringer Define Independent Variable
Where will you find it on a graph?
What is it in this table? Oogs blevs
What is it in this purpose question?
What is the effect of rainfall on length of cactus stems?

2. Jack wants to know the best watering plan for his spider plants
Jack wants to know the best watering plan for his spider plants. He puts all the plants in the same shady environment and gives each 2 cups of water with every watering. One batch he waters daily, one batch he waters twice a week, and one batch he waters weekly. After 2 months he measures the height of the plants.

3. THE CELL

4. Definition of Cell
A cell is the smallest unit that is capable of performing life functions.

5. Vocabulary Be able to define/explain these
Cell Theory
Prokaryote
Eukaryote
Bacteria
Archaea
Extremophile
Unicellular
Multicellular
Nucleus
Flagellum
Pili
Cytoplasm
Ribosomes
Membrane

6. Cell Theory All organisms are composed of cells
Cells are the basic units of structure and function in organisms
3. All cells come from preexisting cells

7. Two types of cells Prokaryotic Pro / karyote Before / nucleus (Greek)
Prokaryotes: more primitive cells that lack a true nucleus.
Eukaryotic
Eu / karyote
True / nucleus
Eukaryotes: cells that have a true membrane bound nucleus that contains the DNA

8. Prokaryotic cells
Two domains in living world: Archaea and Bacteria 8

9. E. coli bacteria on the head of a steel pin.
These are prokaryote
E. coli bacteria on the head of a steel pin.
For the first half of geological time our ancestors were bacteria. Most creatures still are bacteria, and each one of our trillions of cells is a colony of bacteria. Richard Dawkins 9

10. Archaea Not discovered until late 1970s
Once thought to inhabit only extreme environments: hot springs, deep sea trenches, under the earth, salt flats (extremophiles) but now known to live everywhere
Leading scientists to rethink how life arose in early days of Earth

11. Prokaryote lifestyle unicellular: single cell
colony: group of individual cells
filamentous: forms a chain of cells 11

12. Prokaryotic Cell Very small: .1-10 microns
Capsule – slimy outer surface present only in some bacteria
Cell wall – protects cell and gives it shape
Plasma membrane – regulates movement of materials in and out of cell
Flagellum – allows cell to move
Pili – allows cell to stick to surfaces
Very small: microns

13. Prokaryotic Cell
Cytoplasm – gel-like liquid that contains parts that do work of the cell
Ribosomes – build proteins
DNA – hereditary material sits loose in the cell, is not organized in chromosomes

14. Prokaryotes play a huge role in our lives
Yes, harmful diseases
Strep throat
Circular shaped cells (cocci) TB
Rod shaped cells (bacilli)
Lyme disease
Spiral shaped cells (spirochete)

15. But life wouldn’t exist as we know it without them
Cyanobacteria: their ability to photosynthesize created the oxygen-rich atmosphere that exists today

16. Digestion – E coli in our intestines helps us break down food to get the nutrients we need

17. Decomposers: recycle nutrients
Example: nitrogen-fixing bacteria: help plants that we eat obtain enough nitrogen to grow

18. Biotechnology: solutions for major problems
Example: environmental clean-up

19. Example: Faster growing, disease resistant, more nutritious food

20. Example: Cure diseases

21. Eukaryotes Includes 4 kingdoms: Plants Protists Fungi Animals
(including us)

22. Eukaryotes vs. Prokaryotes
Big differences:
Have a membrane-bound nucleus that encloses the DNA
DNA is organized as chromosomes
Have other membrane-bound organelles to carry out cell life processes
Much larger ( microns)
Specialize to form multicellular organisms

24. Advantages of each kind of cell architecture
Prokaryotes
Eukaryotes
simple and easy to grow
can specialize
fast reproduction
multicellularity
can live in many different environments
can build large bodies 24

25. http://videos. howstuffworks