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THE CELL. Structure. Cells are mainly formed of water, but present in their structure are proteins, carbohydrates, and nucleic acids (DNA). Cell membrane Cell wall Nucleus. THE CELL. Cell Membrane. Separates the parts inside the cell from the outside. - PowerPoint PPT Presentation
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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/
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