Questions:

Q1. Carrier molecules that bring materials into cells are

1. Lipids
2. Proteins
3. Glycogen
4. Phospholipid

Q2. Arrange the following compounds in order of increasing membrane permeability: N₂, water, glucose and RNA.

1. RNA>glucose>water>N₂
2. N₂>water>glucose>RNA
3. Water>N₂>glucose>RNA
4. N₂>water>RNA>glucose

Q3. The rate of diffusion across the cell membrane is affected by the

1. temperature and pinocytosis.
2. temperature and size of the molecule.
3. membrane structure and phagocytosis.
4. shape of glycolipids and glycoproteins.

Q4. How many of the following factors would affect the permeability of the cell membrane? • Size of molecules • Lipid solubility of molecules •Presence of transport channels • Presence of ATP inside the cell.

1. One.
2. Two.
3.  Three.
4.  Four.

Q5. Which of the following aids the movement of glucose across a cell membrane?

1.  Protein.
2.  Phosphate.
3. Glycolipid.
4. Cholesterol.

Q6. In the parietal cells of the stomach, the uptake of chloride ions is coupled to the transport of bicarbonate ions out of the cell. This type of active transport system is called, 

1. Uniprot
2. Symprot
3. Antiprot

Q7. Which of the following conditions is required for diffusion to occur?

1. ATP energy.
2. A living cell.
3. A concentration difference.
4. A selectively-permeable membrane.

Q8. Frog eggs placed in an isotonic solution will  

1.  burst.
2.  shrink.
3.  remain the same.
4.  increase in volume.

Q9. When put in a hypotonic environment, an animal cell will 

1.  swell.
2. shrink.
3. secrete enzymes.
4. remain unchanged.

Q10. Which of the following conditions would cause red blood cells to burst?  

1.  pH of 7.5.
2.  Temperature of 3°C.
3. Being placed in distilled water.
4. Being placed in an 11% salt solution.

Q11. In an experiment, frog's eggs were placed in a salt solution. After several hours their mass increased significantly. We can therefore conclude that, compared to the frog's eggs, the solution was  

1. isotonic.
2.  saturated.
3. hypotonic.
4. hypertonic.