2 - Nat 5 Biology - Transport across cell membrane

What are the two main components of cell membranes?

• Proteins and cellulose

• Cellulose and phospholipids

• Phospholipids and proteins

A glucose molecule diffuses out of a cell through the selectively permeable membrane. What is this an example of?

• Active transport

• Osmosis

• Passive transport

The diagram shows three animal cells. Pairs of red circles represent oxygen molecules. Between which two cells is there the highest oxygen concentration gradient?

• One and two

• Two and three

• One and three

What may happen to red blood cells placed in pure water?

• They would burst

• They would become turgid

• They would shrink

Which structure can prevent a plant cell from bursting when it gains water by osmosis?

• Cell membrane

• Cell wall

• Vacuole

What will happen when plant cells are placed in pure water?

• They will burst

• They will become plasmolysed

• They will become turgid

What could cause a plant cell to become plasmolysed?

• Gain of water

• Loss of water

• Vacuole swelling up

Which of the following processes requires energy to occur?

• Osmosis

• Passive transport

• Active transport

Identify the turgid cell.

• A

• B

• C

• D

Which cell or cells have lost water?

• A

• B

• C

• D