Chapter 8: Movement through Cell Membrane

Question 1

Diffusion

Answer 1

The passive movement of particles from a region of high concentration to a region of low concentration
e.g, osmosis

Question 2

Semi-permeable

Answer 2

Control the movement of biomolecules and allows some but not all molecules to pass through
eg, biological membrane

Question 3

Biological membranes

Answer 3

Selectively permeable
Cellophane, visking tube and dialysis tubing
Not all molecules can pass freely across our cell membranes
Salt, glucose and amino acids are restricted

Question 4

Passive transport

Answer 4

No energy is required for it to occur

Molecules move to fill the available space

Question 5

Crenation

Answer 5

When water leaves the cell by osmosis

Question 6

Osmosis

Answer 6

The movement of water molecules from a region of high water concentration to a region of low water concentration across a semi-permeable membrane
eg, crenation

Question 7

Solvent

Answer 7

A liquid that dissolves other substances

eg, water

Question 8

Application of Osmosis/Food Preservation

Answer 8

Fish and meats (bacon) are soaked in a salty solution to preserve them
A high sugar concentration prevents the growth of micro-organisms, eg, jam

Question 9

Turgor

Answer 9

The pressure of the contents (cytoplasm and vacuole) of a cell against its cell wall
(Any organism with a cell wall)

Question 10

Function of Food Preservation

Answer 10

Helps to maintain the shape and strength of the cell wall

Question 11

A plant full of water is

Answer 11

Turgid

Question 12

Plasmolysis

Answer 12

The process of water loss from a plant cell when the cell membrane shrivels inwards away from the cell wall