3. movement into and out of cells

Question 1

diffusion

Answer 1

the net movement of particles from a region of their higher concentration to a region of their lower concentration as a result of their random movement

Question 2

concentration gradient

Answer 2

an imaginary slope from a high concentration to a low concentration

Question 3

independent variable

Answer 3

variable that is changed`

Question 4

dependent variable

Answer 4

variable that is measured

Question 5

control variable

Answer 5

variable that stays the same

Question 6

partially permeable membrane

Answer 6

a membrane that lets some particles move through it, but prevents other passing through

Question 7

osmosis

Answer 7

the diffusion of water molecules through a partially permeable membrane

Question 8

osmosis (in terms of water potential)

Answer 8

the net movement of water molecules from a region of higher water potential (dilute) to a region of their lower water potential (concentrated) through a partially permeable membrane

Question 9

turgid

Answer 9

description of a plant cell that is tight and firm

Question 10

turgor pressure

Answer 10

the pressure of the water pushing outwards on a plant cell wall

Question 11

flaccid

Answer 11

a description of plant cell that is soft

Question 12

plasmolysed

Answer 12

a description of a plant cells in which te cell membrane tears away from the cell wall

Question 13

active transport

Answer 13

the movement of molecules or ions through a cell membrane from a region of lower concentration to a region of higher concentration using energy from respiration

Question 14

carrier proteins

Answer 14

protein molecules in cell membranes that can use energy to change shape and move ions or molecules into or out of a cell