Cell Transport

does not require energy

• active transport

• passive transport

requires energy

• active transport

• passive transport

moves particles from a LOW concentration to a HIGH concentration

• active transport

• passive transport

moves particles from a HIGH concentration to a LOW concentration

• active transport

• passive transport

examples are diffusion, facilitated diffusion, and osmosis

• active transport

• passive transport

examples are cell pump, endocytosis, and exocytosis

• active transport

• passive transport

moves molecules "down" or "with" a concentration gradient

• active transport

• passive transport

moves molecules "up" or "against" a concentration gradient

• active transport

• passive transport

This is the main component of the cell membrane. What is it called?

• carbohydrate

• cholesterol

• channel protein

• phospholipid

What is the purpose of the structure labeled Z?

• to help cells recognize each other

• help move big molecules through the cell membrane

• to keep the cell membrane flexible

• to protect the cell against invaders