THE CELL Cells are mainly formed of water, but present in their structure are proteins, carbohydrates, and nucleic acids (DNA). Structure Cell membrane.

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Presentation transcript:

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 Membrane Separates the parts inside the cell from the outside Support for the cytoskeleton, shape for the cell Substances pass through it Cell communication

THE CELL Cell Wall Strength and rigidity Protection Retains water It is different between eukaryotes and prokaryotes and plants and fungi

THE CELL Workshop 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 CELL ANIMAL CELL http://www.enchantedlearning.com/subjects/animals/cell/

THE CELL PLANT CELL http://www.enchantedlearning.com/subjects/plants/cell/

THE 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 synthesis

THE CELL - Transport Cell Membrane  Phospholipids have both hydrophilic and hydrophobic regions: nonpolar tails (hydrophobic), polar heads (hydrophilic) Pg 85

THE CELL - Transport Cell Membrane  It also has proteins in the membrane, which function is regulate the movement of some substances Pg 86

THE CELL - Transport PASSIVE TRANSPORT Release wastes and take in some substances PASSIVE TRANSPORT Cell membrane: acts as selectively permeable screen. Movement of molecules between areas of different concentrations

PASSIVE TRANSPORT: no energy is needed THE CELL - Transport PASSIVE TRANSPORT: no energy is needed Diffusion: movement of molecules -like oxygen- from areas of high concentration to areas of low concentration. Osmosis: movement of WATER through a semipermeabe membrane from areas of lower concentrations to areas of higher concentrations.

THE CELL - Transport 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

Active Transport: energy is needed THE CELL - Transport Active Transport: energy is needed Allows the movement of molecules from an area of low concentration to an area of high concentration. THIS REQUIRES ENERGY!!  sodium - potassium pump   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: Explain the process 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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