Unit 2 Day 1 (cell transport)

What is diffusion?

• when molecules move from a low concentration to a high concentration 
• when molecules move from a high concentration to a low concentration.
• no movement 
• molecules move everywhere

Osmosis

• diffusion of water molecules through a semi-permeable mebrane from an area of low concentration to an area of high concentration
• the diffusion of particles from an area of high concentration to an area of low concentration
• diffusion of water molecules through a semi-permeable membrane from an area of high concentration to an area of low concentration
• the diffusion of particles from an area of low concentration to an area of high concentration

Osmosis is the movement of _____ across a membrane.

• food
• energy
• oxygen
• water

_______ regulates what enters and leaves a cell.  

• Cell Membrane
• Nucleus
• Mitochondria
• Cytoplasm

Equilibrium?

• a large  amount of substance on  side of the cell and a small amount on the other side
• a small  amount of substance on  side of the cell and a large amount on the otherside
• equal amount of substance on either side of the membrane  
• no particles on either side of the a cell membrane

Which way will the water molecules move during osmosis?

• Out of the cell, so the cell shrinks.
• Out of the cell, so the cell swells.
• Into the cell, so the cell shrinks.
• Into the cell, so the cell swells.

Passive Transport means

• Energy is used

• No energy is used

• Energy is created

When the number of water molecules outside of the cell is greater than inside the cell, which will most likely occur?

• Molecules of water will NOT MOVE either way.

• Molecules of water will move OUT of the cell.

• Molecules of water will move INTO the cell.

• Molecules of water will EVAPORATE.

All of the following are functions of a cell membrane EXCEPT

• surrounding and protecting the contents of the cell.

• releasing waste products from the cell.

• producing energy for the cell processes.

• allowing gases to enter the cell.

Which is not a form of passive transport?

• Osmosis

• Facilitated diffusion

• Active transport

• Diffusion