DO NOW- quick answers! What is the function of the cytoplasm? Name 2 organelles found only in plants: What process happens in the mitochondria? Amino acids are the building blocks of…. What type of biological molecule are all enzymes? What are the building blocks of carbohydrates? What numbers on the pH scale are basic? What can starch be broken down into? What is the job of the cell membrane?

Diffusion, Osmosis, and Active Transport Science Practice- Day 3 Coach Taylor & Coach Feil

Passive Transport Movement across the membrane that does NOT require energy

Diffusion The movement of substances from a high concentration to a low concentration

Diffusion The movement of substances from a high concentration to a low concentration Moving from where there is more of something to where there is less of something

Diffusion The movement of substances from a high concentration to a low concentration Moving from where there is more of something to where there is less of something Molecules will move across the membrane until the concentration is equal on both sides of the membrane Molecules will diffuse until they are in equilibrium

I I I I I I I I

Osmosis The diffusion of water Water flowing from a high concentration to a low concentration

Osmosis The diffusion of water Water flowing from a high concentration to a low concentration NO ENERGY REQUIRED

Onion (plant) Cells: When an onion cell is placed in a salt water solution, water will leave the cell. The cell membrane will shrink as water leaves the cytoplasm THE CELL WALL WILL STAY THE SAME

CELL WALL CELL MEMBRANE CYTOPLASM

SALT WATER

CELL WALL CYTOPLASM CELL MEMBRANE

DISTILLED WATER (100% H2O, Fresh Water, Pure Water)

Active Transport Movement from a LOW concentration to a HIGH concentration From where there is LESS to where there is MORE ATP is required!!!! “Against the concentration gradient”

Cell Membrane The cell membrane is the organelle that controls what enters and leaves the cell “Selectively Permeable” Permeable- Able to pass through

Permeable- small molecules, C6H12O6, H2O, O2, CO2 NOT permeable- big molecules, STARCH