11-31. 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

11-3Describe 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 DiversityCell Diversity Cell ShapeCell Shape

– Shape reflects functionShape reflects function

Function of Nerve cell?Shape?

Function ofSkin Cells?Shape?

Cell DiversityCell Diversity Cell SizeCell Size– Cells vary in sizeCells vary in size

Nerve cells in giraffe neck vs. Human egg Nerve cells in giraffe neck vs. Human egg cell - size of a .cell - size of a .

– Cell size is limited by it’s surface area to Cell size is limited by it’s surface area to volume ratiovolume ratio

What is the problem with increasing What is the problem with increasing cell size?cell size?

Volume increases faster than surface Volume increases faster than surface area as a cell growsarea as a cell grows– PROBLEM:PROBLEM:

needed materials can’tneeded materials can’tget in fast enough get in fast enough (O2, glucose) and (O2, glucose) and wastes out fast wastes out fast enough (CO2)enough (CO2)

Notice SA increasedNotice SA increasedonly 25 times and theonly 25 times and thevolume increasevolume increase125 times125 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 Cell TypesTypes

ProkaryoteProkaryote– No nucleusNo nucleus– No membrane No membrane

bound organellesbound organelles– Still have DNA Still have DNA

mass in center of mass in center of cellcell

– Small / simpler Small / simpler than eukaryotic than eukaryotic cellscells

– Example:Example: BacteriaBacteria

Cell Cell TypesTypes

EukaryoteEukaryote– 1 or more cells1 or more cells– Have membrane Have membrane

bound organellesbound organelles– Larger / more Larger / more

complex than complex than prokaryotesprokaryotes

– Examples:Examples: plants, animals,

fungi, and organisms commonly called “protists.”

11-41. At least two things that all cells have in common? (use notes if necessary)?

REVIEW

11-51. What organelle are you assigned and what’s its function?

11-81. 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 3After 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.

11-10

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

11-10Describe 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?

Ribosome Microtubule

Phospholipids Nucleotide

Cytoskeleton Endoplasmic reticulum

DNA Prokaryotic

Bacteria Cell membrane

Ribosome Microtubule

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 As prokaryotic cells evolved they

engulfed other prokaryotic cells, engulfed other prokaryotic cells, which eventually became eukaryotic which eventually became eukaryotic cellscells

– Scientists think that this is how Scientists think that this is how mitochondria and plastids became mitochondria and plastids became incorporated into plant and animal incorporated into plant and animal cellscells

– Evidence?Evidence?– Mitochondria and plastids have DNA Mitochondria and plastids have DNA

that varies from the rest of the cellthat varies from the rest of the cell Mitochondria have their own DNA and only Mitochondria have their own DNA and only

reproduce from division of preexisting reproduce from division of preexisting mitochondriamitochondria

Plastid DNA is very similar to DNA of some Plastid DNA is very similar to DNA of some photosynthetic bacteriaphotosynthetic bacteria

EndosymbiosisEndosymbiosis

EndosymbiosisEndosymbiosis

a._________

b._________c._________

d._________

e.___________

f.___________________________________

g._________

i.__________________________________

j.____________

k._____________________

h.____________________