Transport Across Membranes

Question 1

What is the cell membrane made of?

Answer 1

Phospholipids and Proteins

Question 2

What does selectively permeable mean?

Answer 2

only small, soluble substances such as oxygen and glucose can pass through

Question 3

Diffusion

Answer 3

Passive process where molecules move from an area of high concentration to a low concentration, along a concentration gradient until they are evenly spread.

Question 4

Why is diffusion important?

Answer 4

to allow uptake of raw materials and edit of waste materials.

Question 5

Osmosis

Answer 5

passive process, where water molecules move from an area of high water concentration to an area of low water concentration, through a selectively permeable, until they are evenly spread.

Question 6

Plant cells placed in pure water

Answer 6

take in water by osmosis, become turgid

Question 7

Animal cells placed in pure water

Answer 7

take in water by osmosis, due to lack of cell wall they swell up and burst

Question 8

plant cell in string salt or sucrose solution

Answer 8

lose water by osmosis, plasmolysed

Question 9

Animal cell in strong salt or sucrose solution.

Answer 9

lose water by osmosis, shrink

Question 10

What are diffusion and osmosis both?

Answer 10

passive processes

Question 11

Active Transport

Answer 11

When substances and ions move against the concentration gradient, move from a low concentration to a high concentration, requires energy