National 5 Biology - Unit 1

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

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

• They would burst

• They would become turgid

• They would shrink

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

A plant cell has been placed into a strong salt solution. Select all of the statements that will apply to this situation.

• Water will move from a high water concentration inside the cell to a low water concentration outside of the cell.

• Water will move from a high water concentration outside the cell to a low water concentration inside the cell.

• Cell will become plasmolysed.

• Cell will become turgid.

• Vacuole will fill with water.

An animal cell has been placed into a strong salt solution. Select all of the statements that apply to this situation.

• Water will move from a high water concentration inside the cell to a low water concentration outside the cell.

• Water will move from a high water concentration outside the cell to a low water concentration inside the cell.

• Cell will become plasmolysed.

• Cell membrane will burst.

• Cell will shrink.

Enzymes can be involved in two types of reaction - degradation and _______ ?

What is the optimum pH in this enzyme reaction?

• 0.5

• 1.5

• 3.5

• 5.5