Cell Transport and Membranes

What category of transport does this image represent?

• Passive Transport

• Active Transport

A phospholipid has 2 parts. What are they called?

• Hydrophilic Head, Hydrophobic Tail

• Hydrophobic Head, Hydrophilic Tail

It forms a boundary between the inside of the cell and the outside of the cell.

• Cell Membrane

• Lipid Cleric Layer

• Membrane Gate

• Protein Receptors

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

The difference between osmosis and diffusion is that

• diffusion is passive transport, whereas osmosis is active transport

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

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

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

Plasma membranes are selectively permeable. This means

• anything can pass in and out

• the membrane regulates the passage of the material in and out of the cell

• glucose cannot enter the cell

• cholesterol cannot enter

Tags

NGSS.HS-LS2-3

Small, nonpolar, hydrophobic molecules such as fatty acids

• easily pass through the membrane's bilayer

• very slowly diffuse through the bilayer

• require transport proteins

• enter through endocytosis

Which of the following substances would have the most trouble crossing the membrane by diffusing through the bilayer?

• water

• oxygen

• carbon dioxide

• a sodium ion

What kinds of molecules pass through a cell membrane most easily?

• ionic

• small and hydrophobic

• large polar

• large and hydrophobic

Which of the following allows water to move faster across cell membranes?

• aquaporins

• ATP

• peripheral proteins

• the sodium-potassium pump

What is the diffusion of water only across a cell or semi-permeable membrane?

• Osmosis

• Diffusion

• Active Transport

• Passive Transport