transport systems

Question 1

Active transport?

Answer 1

> when cells move substances in or out across their plasma membrane across the conc gradient
energy is provided by the hydrolysis of ATP

Question 2

Bulk transport?

Answer 2

> cells need to transport large molecules and particles that are too large to pass through the plasma membrane
requires energy from ATP

Question 3

Endocytosis

Answer 3

> how large cells are brought into the cell
a segment of the plasma membrane surrounds and encloses the particles
ATP is needed to provide energy to form vesicles

Question 4

exocytosis

Answer 4

> movement of large polar molecules out of the cell

> segment of the membrane folds round the particle and transports it out of the cell