Nat 5 Key Area 1.2 Transport across membranes

In the diagram, the circles represent molecules on either side of a cell membrane. In which of these diagrams would the molecules move into a cell by diffusion?

• A

• B

• C

• D

Four cylinders of potato tissue were weighed and each was placed into a salt solution of a different concentration. The cylinders were reweighed after one hour and the results are shown.

In which salt solution would most potato cells be plasmolysed?

• A

• B

• C

• D

State a feature of the cell membrane which allows the movement of only some substances into the cell.

(a)  

Name a process, other than osmosis, which allows molecules to pass through the cell membrane

(a)  

Movement of water can cause changes in the appearance of the cell. Name the process responsible for the movement of water.

(a)  

Which of the following processes requires energy?

• Diffusion

• Osmosis

• Active transport

Which cell structure controls the entry and exit of materials to and from the cell?

• Cell wall

• Cytoplasm

• Cell membrane

• Nucleus

The cell membrane is composed of..

• Proteins and cellulose

• Proteins and starch

• Cellulose and lipids

• Proteins and phospholipids

What happens to an animal cell when it is placed in a solution with pure water?

• The cell swells up and bursts

• The cell becomes plasmolysed

• The cell becomes turgid

• The cell shrivels up

What happens to an plant cell when it is placed in a solution with pure water?

• The cell swells up and bursts

• The cell becomes plasmolysed

• The cell becomes turgid

• The cell shrivels up