Miller and Levine Biology

Equilibrium is when the molecules are

• Different on each side

• Almost the same on each side

• The same on each side

A concentration gradient exists when

• Particles are moving

• There is a difference in concentration on each side of the membrane

• When the molecules are called by the cell membrane

Tags

NGSS.MS-LS2-1

Diffusion is the net movement of molecules from an area of ___ concentration to an area of ____ concentration

• Small // big

• Low // high

• High // low

The molecules will continue to move along this ____ until they reach equilibrium

• Gradient

• Concentration gradient

• semi permeable membrane

• Cytoplasm

Once equilibrium is reached molecules will continue to move across a membrane ___ in one direction

• orderly

• Randomly

• In a Single filed line

Requires energy input by the cell

• Active transport

• Diffusion

• Facilitated diffusion

Tags

NGSS.HS-LS2-5

Molecules move along (down) a concentration gradient

• Active transport

• Diffusion

• Facilitated diffusion

Molecules move against (up) a concentration gradient

• Active transport

• Diffusion

• facilitated diffusion

Always involves channel (membrane spanning) proteins

• Active transport

• Diffusion

• Facilitated diffusion

Molecules pass between the phospholipids

• Active transport

• Diffusion

• Facilitated diffusion