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