1.2 - Transport across cell membranes

Question 1

The cell membrane consists of

Answer 1

phospholipids and proteins

Question 2

The cell membrane is

Answer 2

selectively permeable

Question 3

passive transport means

Answer 3

Down the concentration gradient and does not require energy.

Question 4

Examples of passive transport in cells are

Answer 4

Diffusion and osmosis

Question 5

diffusion in cells is

Answer 5

The movement of molecules down a concentration gradient from a higher to a lower concentration

Question 6

Osmosis is

Answer 6

The movement of water molecules from a high water concentration to a low water concentration through a selectively permeable membrane

Question 7

Animal cells in low water concentration will

Answer 7

Shrink. Explain why.

Question 8

Animal cells in high water concentration will

Answer 8

Burst. Explain why.

Question 9

Plant cells in low water concentration will

Answer 9

Become plasmolysed

Question 10

Plant cells in high water concentration will become

Answer 10

Turgid

Question 11

Active transport

Answer 11

Requires energy for membrane proteins to move molecules and ions against the concentration gradient