Passive Transport Mrs. Harper 9/29/17 Biology.

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Presentation transcript:

Passive Transport Mrs. Harper 9/29/17 Biology

September 29, 2017 Download notes from webpage Begin working on Do Now

Do Now 9/15/15 List at least three factors that affect the performance of an enzyme in a chemical reaction. What is the function of an enzyme? Enzymes are an example of which macromolecule? Define catalyst. What do enzymes do to the activation energy required by a reaction? What does it mean when an enzyme denatures? What do you think the word “passive” means?

Today’s Topic: Transport in the Cell

Demonstration Video Make observations and answer the questions as you watch. https://www.youtube.com/watch?v=9ghYur0vqgE

Passive Transport Does NOT require energy No energy (ATP) is necessary for movement of molecules Passive = no energy needed

Passive Transport & Concentration Gradient In passive transport, molecules move from an area of high concentration to an area of low concentration. HIGH  LOW Goes with the natural flow

Types of Passive Transport Diffusion Natural movement of small particles Facilitated Diffusion Channel proteins assist with passive transport of larger molecules Osmosis Natural movement of water

(Simple) Diffusion High to low concentration Simple diffusion is the natural movement of small particles High to low concentration Unassisted, no proteins required Continues until equilibrium is reached

Video Simple Diffusion https://www.youtube.com/watch?v=yKS1okdlDo0

Facilitated Diffusion Facilitated diffusion is protein-mediated transport that requires no energy HIGH  LOW Uses transport proteins that are very selective Transports larger/charged molecules

Two Transport Proteins in Facilitated Diffusion Channel Proteins Less complex Carrier Proteins More complex

Video Facilitated Diffusion https://www.youtube.com/watch?v=mzo_B5F7pk4

Take 2 min and explain the differences between (simple) diffusion and facilitated diffusion.

Osmosis Osmosis is the passive movement of WATER molecules through the cell membrane

Osmosis Video https://www.youtube.com/watch?v=w3_8FSrqc-I

Assignment Complete the handout independently Make sure you are writing in complete sentences. Unfinished classwork will become homework Observe Diffusion in Action (Place 2 drops of food coloring into a clear cup of water and analyze results)