Finishing up 4-2:Finishing up 4-2:

Intro to CellsIntro to Cells

Prokaryotes vs. EukaryotesProkaryotes vs. Eukaryotes

•DNA

•membrane bound

•ribosomes

•Similar metabolism

Everything BUT bacteria!

Membrane-Bound Nucleus

Organelles

~10 x larger

Mitosis

BACTERIA!!

Free Floating DNA

No organelles

Tiny!

more primitive

Prokaryotic CellProkaryotic Cell

Eukaryotic Cell Eukaryotic Cell

Organization of CellsOrganization of Cells

• ColoniesColonies– Group of cells, but not a multicellular org.Group of cells, but not a multicellular org.– Cells don’t depend on each otherCells don’t depend on each other

• True MulticellularityTrue Multicellularity– Heirarchy: Heirarchy: – Atoms, molecules, organelles, cells, Atoms, molecules, organelles, cells,

tissues, organs, organ systems, organism!tissues, organs, organ systems, organism!

Heirarchy of OrganizationHeirarchy of Organization

REVIEWREVIEW• What are the three basic parts of all cells?What are the three basic parts of all cells?

– Plasma membrane, cytoplasm, Control CenterPlasma membrane, cytoplasm, Control Center

• What is the factor that limits cell size?What is the factor that limits cell size?– Ratio b/w volume and surface area.Ratio b/w volume and surface area.

• Explain how the volume to surface area ratio Explain how the volume to surface area ratio limits cell size.limits cell size.– If the vol. is too great the insufficient surface area If the vol. is too great the insufficient surface area

cannot move materials efficiently across the cell cannot move materials efficiently across the cell membrane. membrane.

Differences between pro & eukaryotic cells??Differences between pro & eukaryotic cells??

p. 76 p. 76

MICROSCOPE LAB!MICROSCOPE LAB!

• Parts of the microscope 1st – pg 1070

• Prepared Slide

• Wet Mount of Elodea

4-3: 4-3: Cell Organelles & Cell Organelles &

FeaturesFeatures

What cell type has lots of What cell type has lots of organelles??organelles??

• Has lots of membrane systems & Has lots of membrane systems & membrane-bound organelles, too!membrane-bound organelles, too!

Plasma Membrane

Plasma Membrane

http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60058.htm

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