What is a cell (use notes if necessary)?

GOAL SETTING: 1. Unit 2 Test grade = ____% 2. I prepared by… 3. Next time I will prepare by… 4. Goal for next time = ____ If you met your goal + got an A: You may maintain or improve. If you met your goal but did not get an A: You must improve at least 1 percentage points. If you did not meet your goal it stays the same. 11-3

Describe and interpret relationships between structure and function at various levels of biological organization. TODAY: Why are the shape and size of cells important?

READ section 4.2 and answer questions #s 1-6 on page 83 Owl Book Assignment

REVIEW

The cell theory states: What is the cell theory? – –All living things are made up of cells. – –Cells are the basic units of structure and function in living things. – –New cells are produced from existing cells.

Cell Diversity Cell Shape Cell Shape –Shape reflects function Function of Nerve cell? Shape? Function of Skin Cells? Shape?

Cell Diversity Cell Size Cell Size –Cells vary in size  Nerve cells in giraffe neck vs. Human egg cell - size of a. –Cell size is limited by it’s surface area to volume ratio

What is the problem with increasing cell size? What is the problem with increasing cell size? Volume increases faster than surface area as a cell grows Volume increases faster than surface area as a cell grows –PROBLEM:  needed materials can’t get in fast enough (O2, glucose) and wastes out fast enough (CO2)  Notice SA increased only 25 times and the volume increase 125 times

Prokaryotic vs. Eukaryotic Cells – –Eukaryotes are cells that enclose their DNA in nuclei. – –Prokaryotes are cells that do not enclose DNA in nuclei.

Cell Types Prokaryote Prokaryote –No nucleus –No membrane bound organelles –Still have DNA mass in center of cell –Small / simpler than eukaryotic cells –Example:  Bacteria

Cell Types Eukaryote Eukaryote –1 or more cells –Have membrane bound organelles –Larger / more complex than prokaryotes –Examples:   plants, animals, fungi, and organisms commonly called “protists.”

At least two things that all cells have in common? (use notes if necessary)?

REVIEW

What organelle are you assigned and what’s its function?

What limits cell size (notes)?

Teach an organelle: Groups of two w/ one laptop Time to prepare = 20 minutes Task: Prepare one ppt slide including a student friendly def. + at least 1 picture. 1 student will present def to class + the other will explain the picture(s) (I will decide who does what so both of you should be ready to do either!). Presenting time = 45 seconds – 1 minute …PRACTICE

When Done: Save under dsto… (if you don’t know, ask) Go to shssci.wikispaces.com Go to CP Bio Go to CP Bio Unit 3 After Posting: What do you want your classmates to write down? What exactly are you going to say about your picture? Practice NOT reading the slide.

“power house” of the cell = (organelle notes)?

11-10 Describe and interpret relationships between structure and function at various levels of biological organization. TODAY: What organelles can be found in a cell and what do they do?

RibosomeMicrotubule Phospholipids Nucleotide Cytoskeleton Endoplasmic reticulum DNA Prokaryotic Bacteria Cell membrane

RibosomeMicrotubule Phospholipids Nucleotide Cytoskeleton Endoplasmic reticulum DNA Prokaryotic Bacteria Cell membrane

Which do you think is older? Scientists think prokaryotic cells evolved first, since they are less complex

Endosymbiosis: Endosymbiosis: –As prokaryotic cells evolved they engulfed other prokaryotic cells, which eventually became eukaryotic cells –Scientists think that this is how mitochondria and plastids became incorporated into plant and animal cells –Evidence? –Mitochondria and plastids have DNA that varies from the rest of the cell  Mitochondria have their own DNA and only reproduce from division of preexisting mitochondria  Plastid DNA is very similar to DNA of some photosynthetic bacteria

Endosymbiosis

Endosymbiosis

a._________ b._________ c._________ d._________ e.___________ f.___________ ____________ ____________ g._________ i.___________ ____________ ___________ j.____________ k.__________ ___________ h._________ ___________