brainteaser what word in the english language is always spelled incorrectly?
TRANSCRIPT
Today you will:
1. Explain Passive Transport.2. Explain Diffusion.3. Explain Osmosis.4. Explain what is meant by
Facilitated Diffusion.5. Identify The parts of a
solution.
A cell has a defect that results in the loss A cell has a defect that results in the loss of its ability to regulate the passage of of its ability to regulate the passage of water, food, and wastes into and out of water, food, and wastes into and out of the cell. In which of the following cell the cell. In which of the following cell structures is this defect most likely to be structures is this defect most likely to be located?located?A. ribosomesB. chloroplastsC. cell membrane D. endoplasmic reticulum
REVIEW
About Cell Membranes
1. All cells have a cell membrane.
2. Functions: a. Controls what enters
and exits the cell to maintain an internal balance called homeostasis.
a. Provides protection and support for the cell.
TEM picture of a real cell membrane.
About Cell Membranes (continued)
3. Structure of cell membrane
Lipid Bilayer -2 layers of phospholipidsa.Phosphate head is
polar (water loving)b.Fatty acid tails non-
polar (water fearing)c. Proteins embedded in
membrane.
Phospholipid
Lipid Bilayer
Proteins
Polar Phosphate heads love water & dissolve.
Non-polar lipid tails
hide from water.
Carbohydrate cell markers
Fluid Mosaic Model of the
cell membrane
About Cell Membranes (continued)
4. Cell membranes have pores (channels) in it
a.Selectively permeable: Allows some molecules in and keeps other molecules out.
b.The structure helps it be selective!
Pores
Types of Cellular Transport
Passive Transport cell does not use energy
1. Diffusion2. Osmosis3. Facilitated Diffusion
Active Transportcell does use energy
1. Protein Pumps2. Endocytosis3. Exocytosis
high
low
This is gonna
be hard work!!
high
low
Weeee!!!
3 Types of Passive Transport
1. Diffusion – movement of particles from area of high concentration to an area of lower concentration.
1. Facilitative Diffusion – diffusion with the help of transport proteins (still high to low.)
1. Osmosis – (it is specific) –the diffusion of water molecules across a semi permeable membrane.
Passive Transport
cell uses NO energy molecules move randomly Molecules spread out from an area of
high concentration to an area of lower concentration.
(HighLow) Three types:
Diffusion Osmosis Facilitated Diffusion
Passive Transport: 1. Diffusion
Diffusion: random movement of particles from an area of high concentration to an area of low concentration.
(High to Low) Diffusion continues until all
molecules are evenly spaced (equilibrium is reached)-Note: molecules will still move around but stay spread out.
http://bio.winona.edu/berg/Free.htm
High Concentration
Low Concentration
Cell Membrane
Watermolecules
Proteinchannel
Transport (channel) Protein
Through a
Cellular Transport from a-
High
Low
• Channel Proteins animations
Passive Transport: 2. Osmosis
High
3. Facilitated diffusion: diffusion of specific particles through transport proteins found in the membrane.
a. Transport Proteins are specific – they “select” only certain molecules to cross the membrane.
b. Transports larger or charged molecules.
Osmosis (Channel Protein)
Diffusion (Lipid Bilayer
)
Passive Transport: 3. Facilitated Diffusion
Carrier Protein
A B
• http://bio.winona.edu/berg/Free.htm
Solutions
A solution is a homogenous mixture of 2 or more substances in a single phase. Solute Solvent
Parts of a Solution
SOLUTE – the part of a solution that is being dissolved (usually the lesser amount)
SOLVENT – the part of a solution that dissolves the solute (usually the greater amount)
Solute + Solvent = Solution
Solution Solute Solvent
Hot chocolate
Orange juice
Salt water
Chocolate milk
In a salt water solution…
Is salt the solute or the solvent? Is water the solute or the solvent? What does the solute do? What does the solvent do?
Solution Worksheet What is the solute and what is the solvent? Label each. Hint: The solvent is always in the greater amount.
SOLUTION
1. Cigarette Smoke Air Cigarette Smoke
spread through Air 2. Copper Gold Gold Ring 3. Caffeine Water Cup of Coffee 4. Silver Copper Sterling Silver 5. Water Oxygen Water in Fish Tank 6. Carbon Dioxide Sugar Water Sealed Can of Pop 7. Oxygen Nitrogen Air 8. Minerals Water Hard Water
solute
solvent
solutesolutesolutesolutesolutesolutesolute
solventsolventsolventsolventsolventsolventsolvent