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Which organisms
have cell walls?
What do the prefixes hyper-, hypo-, and iso- mean?
iso - equal
hyper - higher
hypo - lower
Molecule to be carried
Endocytosis is the process of taking material into the cell.
Exocytosis is the process where materials are forced out of the cell.
Sometimes cells move materials against a concentration difference, the opposite of diffusion.
This process is known as active transport.
Active transport requires energy.
Glucose molecules
Protein channel
Osmotic Pressure
Osmosis exerts a pressure known as osmotic pressure on the hypertonic side of a selectively permeable membrane.
The process by which molecules diffuse across a membrane through protein channels is called
The movement of materials in a cell against a concentration difference is called
Because diffusion depends upon random particle movements, substances diffuse across membranes without requiring the cell to use energy
If a substance is more highly concentrated outside the cell than inside the cell and the substance can move through the cell membrane, the substance will
The concentration of a solution is defined as the
Solution in equilibrium
Area of
Low
Concentration
Area of
High
Concentration
Diffusion
Particles in a solution tend to move from an area where they are more concentrated to an area where they are less concentrated.
More particles
Less particles
A solution is a mixture of two or more substances
The substances dissolved in the solution are called solutes.
The concentration of a solution is the mass of solute in a given volume of solution, or mass of solute/volume.
sugar
coffee
with sugar
(water fearing)
(water loving )
Cell walls are found in plants, algae, fungi, and many prokaryotes.
Cytoplasmic Streaming
What is the main function of the cell wall?
The cell membrane regulates what enters and leaves the cell and also provides protection and support.
Plants, Algae, Fungi & many Prokaryotic Cells have a cell wall
All cells are surrounded by a thin, flexible barrier known as the cell membrane.
Many cells also produce a strong supporting layer around the membrane known as a cell wall.
Cell Wall