Passive Transport

The dye molecules will diffuse throughout the beaker from low to high concentration.

The dye molecules will diffuse throughout the beaker from high to low concentration.

The dye molecules will not move.

There is a higher O2 concentration inside the cell

There is a higher O2 concentration outside the cell

The O2 concentration is in equilibrium - equal amounts on each side of the cell

Most O2 will diffuse out of the cell

Most O2 will diffuse into the cell

O2 will move equally in both directions

O2 will not move

Yes, I need to spend energy

No, I do not need to spend energy

Large molecules, such as sugars and proteins

Small molecules, such as O2 and CO2

Water molecules

Large molecules, such as sugars and proteins

Small molecules, such as O2 and CO2

Water molecules

No, cells do NOT spend energy

Yes, cells DO spend energy

low to high

high to low

equal to equal

Small molecules

Large molecules

Water molecules

Molecules move between phospholipids

Molecules need a protein channel

Small molecules

Large molecules

Water molecules

Molecules move between phospholipids

Molecules need a protein channel

Small molecules

Large molecules

Water molecules

Molecules move between phospholipids

Molecules need a protein channel

Equal concentration of molecules inside and outside

Higher concentration of molecules outside the cell

Higher concentration of molecules inside the cell