Transport across membranes

Question 1

Endocytosis

Answer 1

Movement of large molecules into cells through vesicle formation

• form of active transport

Question 2

Exocytosis

Answer 2

Movement of large molecules out of cells by the fusing of a vesicle containing the molecules with the surface cell membrane; the process requires ATP

Question 3

Phagocytosis

Answer 3

• form of endocytosis
• the active process when a cell engulfs something relatively large such as a bacterium and encloses it in a vesicle

Question 4

Pinocytosis

Answer 4

• form of endocytosis
• the active process by which cells take in tiny amounts of extracellular fluid by tiny versicles

Question 5

Protein channels

Answer 5

Intrinsic proteins with a pore or channel that is lined with hydrophilic amino acids and contains water.