Diffusion and Osmosis

Multiple Choice

What is the organelle that surrounds the outside of every cell?

• Nucleus

• Mitochondria

• Cell Membrane

• ER

Open Ended

What does selectively permeable mean?

Multiple Choice

There is a greater concentration of fish smell....

• Inside the bucket

• outside of the bucket

Multiple Choice

Fill in the blanks-

Diffusion is the movement of molecules from an area of (1)____________ concentration to an area of (2)_____________ concentration

• (1) High, (2) Low

• (1) Low, (2) high

Multiple Choice

______________ is when the concentration of a substance is the same on one side of the membrane as it is on the other side of the membrane

• Equilateral

• proportional

• equilibrium

• unbalanced

Multiple Choice

Where is there a low concentration of perfume?

• in the bottle

• in the room

Multiple Choice

Where is there a low concentration of dye?

• 
  at the bottom of cup

• 
  at the top of cup 

Multiple Choice

Things enter and leave the cell by two ways. Which do you think happens on its own? (does not use energy)

• Active Transport

• Passive Transport

Multiple Choice

Things enter and leave the cell by two ways. Which do you think uses energy?

• Active Transport

• Passive Transport

Uses Energy
Low to high concentration

Example: Endocytosis, Exocytosis

​Active Transport

Does not use energy
High to low concentration

Example: Diffusion, Osmosis, Facilitated diffusion

​Passive Transport

There are two processes cells transport materials through the cell

Multiple Choice

What is Osmosis?

• 
  the movement of WATER molecules across the cell membrane.

• the state where molecules are equally concentrated on both sides of the cell membrane.

• The movement of molecules across the cell membrane that requires energy

• the process that brings large particles into the cell through the cell membrane

Multiple Choice

Where will the water flow

• from the bag into the beaker

• from the beaker into the bag

Multiple Choice

Where is there a high concentration of bbq smoke?

• Inside the BBQ pit

• Outside the BBQ pit

Multiple Choice

Where is there a high concentration of water?

• In the vase

• In the flower

Multiple Choice

What is diffusion

Passive Transport

Facilitated Diffusion

Some molecules are too big to cross the membrane on its own, so a protein channel in the membrane will allow it to pass. Proteins in the membrane create a channel.
- Facilitate means "make easier"
so facilitated diffusion = makes diffusion easier

3 types of passive transport

​Diffusion, Osmosis, Facilitated Diffusion

The cell membrane is selectively permeable. It allows certain things to come in or out of the cell such as water. sugar, oxygen, carbon dioxide.
It does this by either passive transport or active transport.

Passive transport: movement of molecule without the use of energy
- Diffusion: movement of molecules from an area of high concentration to low concentration.
- Osmosis: Movement of water molecules across a membrane.
- Facilitated Diffusion: When molecules are too big they use a channel to move across the membrane.

Active transport: Uses energy, Low to High concentration