TODAY’s Class is on…

Cell Structures

Introduction to Cells:

http://www.youtube.com/watch?v=gFuEo2ccTPA

Agenda

• Misconceptions of Cells vs Atoms

• Finish up Cell Theory: Stem Cells

• Label Organelles Cells Sheet

• Introduce Virus Homework Assignment

Misconception

Students confuse models of cells with atoms…oh

no!

Contains and guards the nucleus which houses the cell's genetic material

Holds neutrons and protons

Atoms are not alive. They do not divide like cells.

Splitting a Cell Splitting an Atom

VS

All matter is composed of atoms

Cell Theory states:1. All organisms are composed of one or

more cells.

2. The cell is the most basic unit of structure and organization in all organisms

3. All cells arise from pre-existing cells

Atom and Cells are Fundamental Units

Understanding Scale is Important

Size Comparison:

http://www.youtube.com/watch?v=0fKBhvDjuy0

http://www.youtube.com/watch?v=fUAFqkS7y9M

Next Topic: Stem Cells

Stem Cells contain the capacity to divide and differentiate along different pathways. Eg. Blood cells, Skin cells, etc.

Positives: Stem Cell Therapy

BBC (4min) http://www.youtube.com/watch?v=cEB8656TCIE

Concern: Using Human Embryo(less than 4 days old)

Discussion• One side: The creation of a human embryonic

stem cell line requires the destruction of human embryo.

• Other side: Medical treatments using stem cells could be developed for a wide range of conditions: eg. Blindness, Parkinson’s, Deafness, Spinal Cord damage.

• Should we use stem cells?• Does the human embryo have human rights?

Think, Pair up and Share your thoughts

Next Activity: Labeling Parts of Cells

Label These Organelles:

– Cell Membrane– Nucleus– Cell Wall– Cytoplasm– Cytoskeleton– Ribosomes– Smooth vs Rough Endoplasmic Reticulum– Golgi Apparatus– Mitochondria– Lysosomes– Cilia and Flagella– Centrioles– Vacuoles– Plastids

14

Prokaryotic Cells Eukaryotic CellsNo nucleus Has a nucleus

No membrane bound organelles Membrane bound organelles

Unicellular Unicellular or multicellular

Naked circular DNA, no chromosomes

DNA associated with proteins, wound into chromosomes

No mitochondria Mitochondria for respiration

70s ribosomes 80s ribosomes

ie Bacteria like E. coli

ie cells found in animal, plant and fungi

Homework for Next Class:

• Go on Weebly and you will see homework for next class

• You will investigate a virus and present your finding next class

• Must come in prepared with notes of the functions of organelles.

• Instructions are on Weebly

Extra Videos

Crash Course on Eukaryotes: http://www.youtube.com/watch?v=cj8dDTHGJBY

Cellular State of Mind Youtube Video: http://www.youtube.com/watch?v=jqUhWDp73bM

A Stem Cell Story: http://www.youtube.com/watch?feature=player_embedded&v=2-3J6JGN-_Y