Bozeman Transport Across the Membrane 10 questions If

Bozeman : Transport Across the Membrane 10 questions If you took notes you are welcome to use them. 1

Brain pop • User name: Aldine • Password: Brain pop • Watch: Diffusion • Passive Transport 2

• 1. Name one biomolecule that makes up the cell membrane? • 2. 3

• 3. True or False: • 4. Which type of passive transport is the diffusion • Passive transport uses no of water? energy to move small particles with no charge through the cell membrane. • A. Facilitated diffusion • B. Osmosis 4

• 5. There are three types of • 6. True or False osmosis. List one type • Active transport uses proteins to move larger particles through the cell membrane by exocytosis and endocytosis. 5

• 7. Diffusion moves particles from…… • 8. List a human body system that relies heavily on diffusion. • A. High to low concentration • B. Low to high concentration 6

• 9. True or False • 10. The picture below is an example of • A selectively permeable cell membrane lets particles move freely in and out of the cell. • A. Phagocytosis • B. Pinocytosis 7

Bozeman : Cell Membranes 5 questions If you took notes you are welcome to use them. 8

• 1. What is the main biomolecule found in the cell membrane? • 2. True or False • The cell membrane is considered fluid, which means it moves like water. 9

• 3. The cells can signal each other as if they could communicate. • 4. The head of the phospholipid is polar or has a charge? • True or False 10

• 5. Proteins move large particles through the cell membrane. • True or False 11

Login For Chrome Books: User name is your first and last initial and ID number @aldine-isd. org Password: first and last initial and your 8 digital birthday Brain pop login • User Name: Aldine • Password: Brainpop Cell structures Cell specialization Body Chemistry classroom. google. com 12

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Cell membrane notes • Question • • What are the functions of the cell membrane? • What does selective mean? • What does permeable mean? • What does selectively permeable mean? • What is impermeable? • What biomolecules make up the cell membrane? Answer 14

What is the function of the cell membrane? • • • 1. 2. 3. 4. It protects the cell. It lets things in and out of the cell. Maintains homeostasis (balance). Transmits signals through out the cell. 15

Where is the cell membrane located? Is is the layer around the cell. Magnified to see 16

The cell membrane is selectively permeable, what does this mean? • The word selective means “picky” or choosey. ” • The word permeable means letting things go in and out. • Just like the colander lets the water out but not the noodles. • Impermeable means nothing is going in or out of the membrane. 17

Fluid mosaic model (Cell Membrane) 18

The cell membrane is made up of two layers of fat (phosopholipids) • It contains two parts: • The hydrophilic (waterloving) polar • • The hydrophobic (waterdislike) tails are nonpolar 19

• Question • Answer • What is passive transport? • give two examples • What is active transport? • give two examples • We are going to draw a picture to illustrate passive and active transport. (give a handout) 20

What does the word concentration mean? • It means that there is a high volume of the substance. • For example: When you buy orange juice from concentrate where is there a high volume of OJ in or out of the tube? 21

• There are two different ways particles move across the cell membrane. Passive Transport • Active Transport • * No energy needed • * Energy needed to to move particles from an an area of high to low area of low to high concentration. • Examples are • Examples: diffusion, osmosis, and endocytosis and facilitated diffusion. exocytosis. 22

Active or Passive? A B 23

Passive transport includes diffusion. • It is when particles move from an area of high concentration to low concentration not using energy. 24

Facilitated Diffusion uses proteins to help the membrane move large substances in and out of the membrane. 25

Passive transport also includes osmosis. • Osmosis is a type diffusion (moving substances from an area of high to low concentration, not using energy) but using WATER!! 26

• Question What is a solution? • Answer Three types of Osmosis! • What is a isotonic? • What is a hypertonic? • What is a hypotonic? 27

What is a solution? • Solute = Is the stuff • Solvent = Water 28

What is isotonic? • Isotonic means the same amount of “STUFF. ” No change is seen in the cell. 29

What is hypertonic? • Hypertonic is more “STUFF. ” This causes the cell to shrink. 30

What is hypotonic? • Hypotonic means less stuff. This causes the cell to get larger or swell. 31

Is the cell hypertonic, hypotonic, or isotonic and how will water move? A. 32% water 68% stuff Solution is hypertonic When solving osmosis problems first find out if they are asking about the cell or the solution. Confusing right!! Here is a hint. The arrow always moves to hypertonic. 32% salt 68% water Cell is hypotonic Lets work some problems together. 32

Osmosis Lab • There are 14 stations with 41 questions. • You must label the station and answer the questions at each station. If drawing is asked then do so please! 33

Station 1 • Answer the 3 questions 34

What is surface tension? • Milk is mostly water, and water has a property called surface tension, this is because all the water molecules are strongly attracted to other water molecules, but not to air, so they try to get away from the surface of the drop, making the surface as small as possible, this is why raindrops are approximately spherical - the shape with the least surface for its volume. • This means that the surface of water, or milk, is always trying to shrink. 35

Psychedelic Milk • Dishwashing liquid is designed to break up the surface tension so water can dissolve fats and grease. This means that where you add the washing up liquid the surface tension is much weaker than everywhere else, so this surface gets hugely stretched by the milk which hasn't met the washing up liquid yet. 36

Psychedelic Milk • Why does washing up liquid reduce surface tension? • A washing up liquid molecule is made up of a water loving head and a water hating tail, so when you add it to water the molecules arrange themselves over the surface - head inwards. The water is strongly attracted to the heads of these molecules, so is now stops trying to reduce its surface area, and the surface tension is far weaker. • 37

The second type of transport is ACTIVE TRANSPORT. • This type of transport needs energy to move substances through the cell membrane from an area of low to high concentration. • LETS LOOK AT A FEW EXAMPLES! 38

ENDOCYTOSIS= Into cell • Endocytosis is the movement of a particle inside the cell membrane using energy. 39

EXOCYTOSIS= out of cell • Exocytosis is the moving of particles outside of the cell using energy. 40

Which is which? ? ? 41

Active transport is a process where energy is used! Why? • Active transport needs energy because it has to move substance from an area of low to high concentration. • It kind of has to shove the stuff in or out! 42

Cell Membrane lab (12 stations) 43

Notebook • • Animal and Plant cell notes and drawings Cell membrane notes Dot problems Beaker problems. 44