c h. 6 w arm -u p 1.what are the 2 main types of cells? which domains do they consist of? 2.list 3...
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CH. 6 WARM-UP
1. What are the 2 main types of cells? Which Domains do they consist of?
2. List 3 ways that eukaryotes differ from prokaryotes.
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CH. 6 WARM-UP
1. How is the size of a cell related to its function?
2. Name 5 organelles or cell structures and their function.
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WARM-UP ACTIVITY:
Pick up handout on back counter.Complete this handout for your
warm-up activity.
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CH. 6 WARM-UP
Animal Cell Plant Cell
Compare and contrast Animal vs. Plant Cells
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CH. 6 WARM-UP
What is the structure & function of:1. Microtubules2. Microfilaments3. Intermediate filaments
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CH. 6 WARM-UP
What is the function of:1. Plasmodesmata2. Gap junctions3. Tight junctions4. Desmosomes
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CHAPTER 6
A Tour of the Cell
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YOU MUST KNOW
Three differences between prokaryotic and eukaryotic cells.
The structure and function of organelles common to plant and animal cells.
The structure and function of organelles found only in plant cells or only in animal cells.
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2 TYPES OF CELLS:
1. Prokaryotes: Domain Bacteria & Archaea
2. Eukaryotes (Domain Eukarya): Protists, Fungi, Plants, Animals
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A PROKARYOTIC CELL (BACTERIA)
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PROKARYOTE VS. EUKARYOTE “before” “kernel” No nucleus DNA in a nucleoid Cytosol No organelles other
than ribosomes Small size Primitive i.e. Bacteria &
Archaea
“true” “kernel” Has nucleus and
nuclear envelope Cytosol Membrane-bound
organelles with specialized structure/function
Much larger in size More complex i.e. plant/animal cell
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CELL SIZE AND SCALEhttp://learn.genetics.utah.edu/content/begin/cells/scale/
Scale of the Universe:
http://www.onemorelevel.com/game/scale_of_the_universe_2012
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Cells must be small to maintain a large surface area to volume ratiosurface area to volume ratio
Large S.A. allows rates of chemical exchange between cell and environment
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SURFACE AREA EXAMPLE (ANIMALANIMAL):
Small Intestine: highly folded surface to increase absorption of nutrientsVilliVilli: finger-like projections on SI wallMicrovilliMicrovilli: projections on each cell
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FOLDS FOLDS VILLI VILLI MICROVILLI MICROVILLI
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SURFACE AREA EXAMPLE (PLANTPLANT):
Root hairsRoot hairs: extensions of root epidermal cells; increase surface area for absorbing water and minerals
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NUCLEUS Function: control center of cell Contains DNA Surrounded by double membrane (nuclear
envelope)Continuous with the rough ER
Nuclear pores: control what enters/leaves nucleus
Chromatin: complex of DNA + proteins; makes up chromosomes
Nucleolus: region where ribosomal subunits are formed
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NUCLEUS Contains DNA Function: control center of cell Surrounded by double membrane (nuclear
envelope)Continuous with the rough ER
Nuclear pores: control what enters/leaves nucleus
Chromatin: complex of DNA + proteins; makes up chromosomes
Nucleolus: region where ribosomal subunits are formed
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RIBOSOMES Function: protein synthesis Composed of rRNA + protein Large subunit + small subunit Types:
1. Free ribosomes: float in cytosol, produce proteins used within cell
2. Bound ribosomes: attached to ER, make proteins for export from cell
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ENDOMEMBRANE SYSTEM:Regulates protein traffic & performs metabolic functions
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ENDOPLASMIC RETICULUM (ER) Network of membranes and sacs Types:
1. Rough ER: ribosomes on surface Function: package proteins for secretion,
send transport vesicles to Golgi, make replacement membrane
2. Smooth ER: no ribosomes on surface Function: synthesize lipids, metabolize
carbs, detox drugs & poisons, store Ca2+
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ENDOPLASMIC RETICULUM (ER)
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GOLGI APPARATUS Function: synthesis & packaging of materials (small
molecules) for transport (in vesicles); produce lysosomes
Series of flattened membrane sacs (cisternae)Cis face: receives vesiclesTrans face: ships vesicles
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LYSOSOMES Function: intracellular digestion; recycle cell’s
materials; programmed cell death (apoptosis) Contains hydrolytic enzymes
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VACUOLES Function: storage of materials (food, water,
minerals, pigments, poisons) Membrane-bound vesicles Eg. food vacuoles, contractile vacuoles Plants: large central vacuole -- stores water,
ions
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Parts of plant & animal cell p 108-109
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MITOCHONDRIA Function: site of cellular respiration Double membrane: outer and inner membrane Cristae: folds of inner membrane; contains
enzymes for ATP production; increased surface area to ATP made
Matrix: fluid-filled inner compartment
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CHLOROPLASTS Function: site of photosynthesis Double membrane Thylakoid disks in stacks (grana); stroma
(fluid) Contains chlorophylls (pigments) for
capturing sunlight energy
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ENDOSYMBIONT THEORY
Mitochondria & chloroplasts share similar origin
Prokaryotic cells engulfed by ancestors of eukaryotic cells
Evidence: Double-membrane
structureHave own ribosomes &
DNAReproduce
independently within cell
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PEROXISOMES Functions: break down fatty acids; detox
alcohol Involves production of hydrogen peroxide
(H2O2)
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CYTOSKELETON: NETWORK OF PROTEIN FIBERS Function: support, motility, regulate
biochemical activities
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EXTRACELLULAR MATRIX (ECM) Outside plasma membrane Composed of glycoproteins (ex. collagen) Function: Strengthens tissues and transmits external
signals to cell
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INTERCELLULAR JUNCTIONS (ANIMAL CELLS)
Tight junctions: 2 cells are fused to form watertight seal
Desmosomes: “rivets” that fasten cells into strong sheets
Gap junctions: channels through which ions, sugar, small molecules can pass
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PLANT CELLS
Cell wall: protect plant, maintain shapeComposed of
cellulose Plasmodesmata:
channels between cells to allow passage of molecules
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Plant Cells Only Animals Cells Only
Central vacuoles Lysosomes
Chloroplasts Centrioles
Cell wall of cellulose Flagella, cilia
PlasmodesmataDesmosomes, tight and gap junctions
Extracellular matrix (ECM)
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HARVARD CELL VIDEOhttp://multimedia.mcb.harvard.edu/anim_innerlife.html