N5 Biology - Unit 1 MCQ

2. Which line in the table below identifies the direction of diffusion of the three substances during muscle contraction?

3. Proteins have different functions. Which of the following statements identifies a protein and its function?

• A Hormones carry oxygen around the body.
• B Enzymes carry chemical messages around the body.
• C Antibodies defend the body against disease.
• D Cellulose provides strength and structure to a plant cell wall

4. In the diagrams below, 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?

5. Some stages of genetic engineering are shown below. Which letter indicates the stage where the plasmid is inserted into a bacterial cell?

6. The diagram below shows parts of a plant cell. Which part of this cell is composed of cellulose?

7. 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 below. In which salt solution would most potato cells be plasmolysed?

8. Which of the following shows the correct DNA base pairing?

9. Hormones are composed of

• A glycerol.
• B glucose.
• C protein.
• D starch.

10. The following diagrams represent three different cells. Identify the plant cell(s).

• A P and R only
• B P and Q only
• C P only
• D R only

11. The graph shows the concentrations of ions in a single-celled organism and the sea water surrounding it. Use the graph to identify which of the following statements is correct.

• D Potassium ions will move into the organism by active transport.
• A Sodium ions will move into the organism by active transport.
• B Sodium ions will move out of the organism by diffusion.
• C Potassium ions will move into the organism by diffusion.
• Option 5