2.1 Exchange with the Environment

Question 1

the movement of particles from regions of higher density to regions of lower density

Answer 1

diffusion

Question 2

the diffusion of water through a semipermeable membrane

Answer 2

osmosis

Question 3

the movement of substances across a cell membrane without the use of energy by the cell

Answer 3

passive transport

Question 4

the movement of substances across a cell membrane that requires the cell to use energy

Answer 4

active transport

Question 5

the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell

Answer 5

endocytosis

Question 6

the process in which a cell releases a particle by enclosing the particle in a vesicle that then moves to the cell surface and fuses with the cell membrane

Answer 6

exocytosis

Question 7

only certain substances can pass through

Answer 7

semipermeable

Question 8

when small particles, such as sugars, cross the cell membrane through passageways

Answer 8

channels