Cell Membrane - Diffusion & Osmosis

Question 1

What is Cell Membrane?

Answer 1

controls movement of material in and out of cell
selectively permeable

Question 2

Why do substances need to enter and leave?

Answer 2

to transport nutrients or excrete waste

Question 3

What is Diffusion?

Answer 3

molecules move to area of HIGH concentration to LOW concentration until equally distributed
does not require help

Question 4

What is Osmosis?

Answer 4

movement from HIGH water concentration to LOW water concentration
(also low solute to high solute –> high solute can’t pass through cell membrane)

Question 5

What are 3 situations of Osmosis?

Answer 5

Isotonic, Hypotonic, Hypertonic

Question 6

Isotonic

Answer 6

concentration of water outside = inside (Equal amounts will let water move in and out constantly after)

Question 7

Hypotonic

Answer 7

water outside MORE that water inside cell
water moves INTO cell

Question 8

animal cell after hypotonic?

Answer 8

lysis: cell bursts

Question 9

plant cell after hypotonic?

Answer 9

plant cell: strong cell wall –> becomes
(turgid) swollen from absorbing water

Question 10

Hypertonic

Answer 10

water outside LESS than water inside cell
water moves OUT of cell
cell shrinks and wrinkles

Question 11

animal cell after hypertonic

Answer 11

crenation

Question 12

plant cell after hypertonic

Answer 12

plasmolysis - cytoplasm pulls away from cell wall