Cell Membrane and Transport Test Review

When we say the cell membrane is semi permeable, what does that mean?

• allows everything through

• Only allows large items with a charge to go through

• Only allows small items without a charge to go through

• Only allows fluids through

Which part of the phospholipid is hydrophobic ( scared of water)?

• Head

• tails

• protein

• glycerol

Which term describes the difference in concentration of a substance from one location to another?

• high concentration

• low concentration

• concentration gradient

• molecular gradient

How is facilitated diffusion differ from diffusion?

• Energy is needed to move molecules through the cell membrane

• No energy is needed to move molecules through the membrane

• Molecules diffuse through the cell membrane

• Molecules diffuse through transport proteins tha tmake a straw or tunnel

What term describes the diffusion of water through a semipermeable membrane down a concentration gradient?

• Osmotic pressure

• osmosis

• hydro diffusion

• fluid diffusion

What term describes the movement of molecules from an area of low concentration to an area of high concentration?

• passive transport

• active transport

• energy transport

• concentration gradient

How does diffusion differ from endocytosis and exocytosis?

• diffusion moves large molecules across the cell membrane

• diffusion requires energy input from the cell

• diffusion does not require energy input from the cell

• diffusion only transports water

Through what type of protein does active transport occur?

• transport protein

• intracellular proteins

• enzymes

• receptors

What is phagocytosis?

• type of exocytosis the cell expels large particles

• type of exocytosis in chich the cell expels waste

• type of endocytosis in which the cell drinks in fluids

• type of endocytosis in which the cell takes in large particle or "eats"

Is energy required to move oxygen molecules across the cell membrane, from an area of high concentration to an area of low concentration?

• Yes, oxygen does not move across the cell membrane without energy

• Yes, molecules don't move from an area of high concentration to low

• No, oxygen diffuses across the cell membrane which does not require energy

• No, oxygen bonods with water molecules to diffuse across the membrane