11-3 1. What is a cell (use notes if necessary)?.
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Transcript of 11-3 1. What is a cell (use notes if necessary)?.
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11-31. What is a cell (use notes if necessary)?
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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
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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?
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READ section 4.2 and answer questions #s 1-6 on page 83
Owl Book Assignment
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REVIEW
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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.
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Cell DiversityCell Diversity Cell ShapeCell Shape
– Shape reflects functionShape reflects function
Function of Nerve cell?Shape?
Function ofSkin Cells?Shape?
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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
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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
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Prokaryotic vs. Eukaryotic Cells
– Eukaryotes are cells that enclose their DNA in nuclei.
– Prokaryotes are cells that do not enclose DNA in nuclei.
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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
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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.”
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11-41. At least two things that all cells have in common? (use notes if necessary)?
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REVIEW
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11-51. What organelle are you assigned and what’s its function?
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11-81. What limits cell size (notes)?
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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
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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.
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11-10
1. “power house” of the cell = (organelle notes)?
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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?
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Ribosome Microtubule
Phospholipids Nucleotide
Cytoskeleton Endoplasmic reticulum
DNA Prokaryotic
Bacteria Cell membrane
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Ribosome Microtubule
Phospholipids Nucleotide
Cytoskeleton Endoplasmic reticulum
DNA Prokaryotic
Bacteria Cell membrane
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Which do you think is older?
Scientists think prokaryotic cells evolved first, since they are less complex
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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
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EndosymbiosisEndosymbiosis
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EndosymbiosisEndosymbiosis
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