Osmosis etc

Question 1

Facilitated diffusion

Answer 1

The passive movement of molecules across a cell membrane through a protein channel or carrier protein. It moves substances from an area of higher concentration to an area of lower concentration without the need for energy.

Question 2

Osmosis

Answer 2

Osmosis is the movement of water molecules from an area of high water concentration to an area of low water concentration through a semi-permeable membrane.

Question 3

Diffusion

Answer 3

Diffusion is the movement of particles from high concentration to low concentration until evenly spread. It does not require energy. Moves through the phospholipid bilayer

Question 4

Active Transport

Answer 4

Active transport moves molecules from low to high concentration using energy (ATP) and protein pumps.

Question 5

Compare diffusion, facilitated diffusion, and osmosis.

Answer 5

Diffusion: small molecules, high → low, no proteins
Facilitated diffusion: large/charged molecules, high → low, uses proteins
Osmosis: water only, high → low, through semi-permeable membrane