THE CELL• Cells are mainly formed of water, but present in
their structure are proteins, carbohydrates, and nucleic acids (DNA).
Structure• Cell membrane
• Cell wall
• Nucleus
THE CELL
• Cell communication
Cell Membrane
• Separates the parts inside the cell from the outside• Support for the cytoskeleton, shape for the cell
• Substances pass through it
THE CELL
• It is different between eukaryotes and prokaryotes and plants and fungi
Cell Wall
• Strength and rigidity
• Protection
• Retains water
THE CELLWorkshop• Make a scheme where you compare all the
different types of cells there are.• List the differences between the cell wall and
the cell membrane
HOMEWORK:Bring information about the cell organelles and its functions. In groups: classify the organelles of the cell according to the processes related to their functions.
THE CELLANIMAL CELL
http://www.enchantedlearning.com/subjects/animals/cell/
THE CELLPLANT CELL
http://www.enchantedlearning.com/subjects/plants/cell/
Organelles• In groups:
– Each member of the group brings information of the cell’s organelles and their function.
– Discuss about how those organelles and structures influence the function of the cells. Write your conclusions.
– Make a scheme or model of a plant and animal cell indicating all its organelles and functions.
THE CELL
Cell Membrane Phospholipids have both hydrophilic and hydrophobic regions: nonpolar tails (hydrophobic), polar heads (hydrophilic)
THE CELL - Transport
THE CELL - TransportCell Membrane It also has proteins in the membrane, which function is regulate the movement of some substances
PASSIVE TRANSPORT
THE CELL - Transport
Release wastes and takein some substances
Cell membrane: acts asselectively permeablescreen.
Movement of moleculesbetween areas of differentconcentrations
PASSIVE TRANSPORT: no energy is needed
• Osmosis: movement of WATER through a semipermeabe membrane from areas of lower concentrations to areas of higher concentrations.
THE CELL - Transport
• Diffusion: movement of molecules -like oxygen- from areas of high concentration to areas of low concentration.
Solutions can be:
Isotonic: same concentrations, there is an equilibrium
Hypotonic: lower concentrations of dissolved solutes on the outside, therefore water moves into the cell
Hypertonic: higher concentrations of dissolved solutes on the outside, therefore water moves out of the cell
THE CELL - Transport
THE CELL - Transport
Active Transport: energy is neededAllows the movement of molecules from an area of low concentration to an area of high concentration. THIS REQUIRES ENERGY!! sodium - potassium pump
THE CELL - Transport
Endocytosis: membrane surrounds the molecule that is going to be taken inside…
Exocytosis: membrane surrounds the molecule that is going to be pushed outside…
THE CELL
Presentations: PHOTOSYNTHESIS, RESPIRATION, FERMENTATION
Instructions: 1.Explain the process2.Prepare an activity related to the topic
References
• http://library.thinkquest.org/3564/• http://www.cellsalive.com/cells/cell_model.htm• http://www.biologycorner.com/bio1/diffusion.html#• https://docs.google.com/a/clermont.edu.co/present/
view?id=dfh23k67_3097ckdwv8d5
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