AP Biology Membrane

AP Bio Cell Membrane and Transport Reteach

Multiple Choice

In biological membranes, the phospholipids are arranged in a _______, with the_______.

• bilayer; fatty acids pointing toward each other

• bilayer; fatty acids facing outward

• single layer; fatty acids facing the interior of the cell

• single layer; phosphorus-containing region facing the interior of the cell

Multiple Choice

Increases the fluidity of the plasma membrane

• more saturated fatty acids

• more cholesterol

• more unsaturated fatty acids

• more integral proteins

Open Ended

How does an integral protein contribute to passive and active transport?

Open Ended

What makes the cell membrane selectively permeable?

Multiple Choice

The difference between osmosis and diffusion is that

• diffusion is passive transport, whereas osmosis is active transport

• osmosis is the opposite of diffusion and only involves the movement of water

• only in diffusion do molecules move from areas of high concentration to areas of low concentration

• osmosis refers specifically to the movement of water, whereas diffusion refers to the movement of any type of molecules

Open Ended

Why is ATP needed to transport these molecules in active transport?

Multiple Select

What are the difference(s) between facilitated diffusion and a proton pump?

• Facilitated diffusion uses carrier proteins

• Facilitated diffusion uses ATP

• Facilitated diffusion uses high to low concentration of solute

• Facilitated diffusion uses low to high concentration of solute