Cell life - 1.2 Transport across cell membranes

Question 1

What does the cell membrane consist of ?

Answer 1

Phospholipids
proteins

Question 2

What is passive transport ?

Answer 2

Passive transport is the movement of molecules down a concentration gradient from an area of higher concentration gradient to an area of lower concentration gradient. (doesn’t require energy/ ATP)

Question 3

What are examples of passive transport ?

Answer 3

Osmosis
Diffusion

Question 4

What is diffusion ?

Answer 4

Diffusion is the movement of moles from an area of higher concentration down the concentration gradient to an area of lower concentration

Question 5

What substance moves out of the cell through diffusion ?

Answer 5

Carbon dioxide

Question 6

What is osmosis ?

Answer 6

Osmosis is the movement of a water molecule from an area of higher water concentration down the concentration gradient to an area of lower water concentration through a selectively permeable membrane

Question 7

What is active transport ?

Answer 7

Active transport is the movement of molecules against a concentration from an area of lower concentration against the concentration gradient to an area of higher concentration this requires energy/ ATP

Question 8

What is the cell membrane describe as being ?

Answer 8

Selectively preamble

Question 9

What substances move into the cell through diffusion ?

Answer 9

Oxygen
Glucose

Question 10

How will an ANIMAL cell react when placed in a solution with a higher water concentration than the cell content ?

Answer 10

An animal cell will BURST because the cytoplasm will take in the water by osmosis and eventually burst

Question 11

How will an ANIMAL cell react when place in a solution with a lower water concentration than the cell content ?

Answer 11

The cell will SHRINK because their contents will lose water by osmosis and shrink

Question 12

How will a PLANT cell react when placed in a solution with a higher water concentration than the cell content ?

Answer 12

Will become TURGID because the water moves into the cell

Question 13

How will a PLANT cell react when placed in a solution with a lower water concentration than then cell content ?

Answer 13

Plant cells will become PLASMOLYSED because the water will move out of the cell

Question 14

How do molecules move across the cell membrane ?

Answer 14

By passive and active transport