Cell Transport

Diffusion takes place

• only through a lipid bilayer

• from an area of low to high concentration

• only in liquids

• from an area of high to low concentration

The dispersal of ink in a beaker of water is an example of

• diffusion

• osmosis

• active transport

• endocytosis

Sugar molecules can enter cells through the process of

• exocytosis

• facilitated diffusion

• osmosis

• protein pumps

Which of the following does not expend energy?

• diffusion

• endocytosis

• active transport

• a sodium-potassium pump

Which of the following enters a cell by active transport?

• glucose

• water

• lactose

• potassium ion

The process by which water passes into or out of a cell is called

• solubility

• osmosis

• selective transport

• endocytosis

The sodium-potassium pump usually pumps

• potassium or of the cell

• sodium into the cell

• potassium into the cell

• a potassium and sodium molecule together

Ridding the cell of material by discharging it from sacs at the cell surface is called

• pinocytosis

• phagocytosis

• exocytosis

• endocytosis

Molecules that are too large to be moved across a cell membrane can be expelled from the cell by

• diffusion

• lipid carriers

• exocytosis

• osmosis

Placing a plant into a hypertonic environment will

• cause turgor pressure to increase

• cause the plant to take in water

• have no effect

• cause turgor pressure to decrease