Question of the Day 12-6 How are diffusion and osmosis related?

Review

Turgor Pressure – Turgor Pressure – the pressure that exists inside a cell caused by water the pressure that exists inside a cell caused by water High turgor pressure can cause animal cells to burst. Why? High turgor pressure can cause animal cells to burst. Why? They do not have a cell wall. They do not have a cell wall. What would happen if there is low turgor pressure in plants? What would happen if there is low turgor pressure in plants? Causes them to wilt Causes them to wilt Then you water the plant and it will regain the pressure and stand up straight Then you water the plant and it will regain the pressure and stand up straight

Reverse Osmosis

Lab Page 6 questions 12-6

Question of the Day 12-7 Explain the diagram below. A couple hours Iodine and water Corn starch and water

Contractile Vacuoles – Contractile Vacuoles – Organelle that excretes excess water from cells Organelle that excretes excess water from cells Uses ATP Uses ATP Usually found in unicellular freshwater organisms. Usually found in unicellular freshwater organisms. This prevents them from bursting in a hypotonic solution. This prevents them from bursting in a hypotonic solution.

Contractile vacuole Contractile vacuole

Plasmolysis – Plasmolysis – loss of turgor pressure in plant cell due to loss of water loss of turgor pressure in plant cell due to loss of water What happens to a plant during plasmolysis? What happens to a plant during plasmolysis? The plant wilts The plant wilts The plants plasma membrane and cytoplasm will shrink away from the cell wall The plants plasma membrane and cytoplasm will shrink away from the cell wall

REVIEW: What will happen to an Elodea Leaf in a hypertonic solution? What will happen to an Elodea Leaf in a hypertonic solution? Water will leave the cell… Water will leave the cell… …which is called playsmolsis, which will cause the plant leaves to wilt …which is called playsmolsis, which will cause the plant leaves to wilt

Review If we put Elodea leaves in a hypotonic solution, what happens? If we put Elodea leaves in a hypotonic solution, what happens? Water will move into the cell…. Water will move into the cell…. ….which will cause the cell to swell. If it’s an animal cell it will…. ….which will cause the cell to swell. If it’s an animal cell it will…. …burst, UNLESS the cell has a …burst, UNLESS the cell has a Contractile vacuole to pump the water out. to Contractile vacuole to pump the water out. to

Summary of Hypo/Hypertonic solution changes on a RBC.

Review If the cell shrinks, it is in what type of solution? If the cell shrinks, it is in what type of solution? If the cell is at equilibrium with it’s environment, its in what type of solution? If the cell is at equilibrium with it’s environment, its in what type of solution? If the cell swells, it’s in what type of solution? If the cell swells, it’s in what type of solution? Water –90% Salt – 10% Water 95% Salt 5% Water 50% Salt 50% Water 50% Salt 50% Water 64% Salt 36% Water 44% Salt 56%

pages 6-7 assignment

Control egg pd 1 = 50.9 g Control egg pd 2 = 60.8 g

Question of the Day 12-8 How is the egg in lab analogous to a cell?

Nicole CayoKyle Natalie Gilbert LibbyJustin Smigley KennyEvan Allan MaryRyan Freeman SinnerMattJamesKamil LaurenAllie Clowney Victoria MaxAliVince

Quick Talk Hypertonic solution Phospholipid Diffusion Contractile vacoule Turgor pressure Isotonic solution Osmosis Hypotonic molecule Lyse Cell membrane Plasmolysis

Question of the Day What is passive transport (notes page 2)? 2. What’s an example?

Control egg after corn syrup – day 3 – pd 1 = 50.7 grams Control egg after corn syrup – day 3 – pd 2 = 60.8 grams

Nicole CayoKyle Natalie Gilbert LibbyJustin Smigley KennyEvan Allan MaryRyan Freeman SinnerMattJamesKamil LaurenAllie Clowney Victoria MaxAliVince

Selective Permeability – Selective Permeability – plasma membrane to allow some materials to pass while keeping others out plasma membrane to allow some materials to pass while keeping others out Why is selective permeability important? Why is selective permeability important? So the cell can allow important substances in (water, oxygen, glucose) and keep harmful substances out (bacteria). So the cell can allow important substances in (water, oxygen, glucose) and keep harmful substances out (bacteria).

Passive Transport Passive Transport – Passive Transport – movement of particles across membranes by diffusion movement of particles across membranes by diffusion This process uses NO ATP This process uses NO ATP Molecules moving from hi concentration  low concentration Molecules moving from hi concentration  low concentration

Question of the Day Tell me everything you know about passive transport keep a numbered list.

Control egg after corn syrup – day 4 – pd 1 = 51.1 grams Control egg after corn syrup – day 4 – pd 2 = grams

Did your lab results from last week support what you know about osmosis? How or how not? Question of the Day 12-13

Objectives Describe how the structure of the plasma membrane allows it to function as a regulatory structure and/or protective barrier for a cell

What is facilitated Diffusion?

Facilitated Diffusion – Facilitated Diffusion – name for passive transport using proteins name for passive transport using proteins Does not use energy!!! Does not use energy!!! Example: Example: Glucose going from high concentration outside cell low concentration inside the cell Glucose going from high concentration outside cell low concentration inside the cell Why doesn’t this need energy? Why doesn’t this need energy? Because it’s still along the concentration gradient Because it’s still along the concentration gradient

1, 2, 3 assessment

HOMEWORK Homeostasis and Transport guided reading 5.1