THE CELL Cells are mainly formed of water, but present in their structure are proteins,...

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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