Cell Membranes and Transport

1. 1. Identify structure A,B, and C Figure 1.

• A. Cholesterol, Phospolipids, Glycoprotein

• B. Phospolipids, Glycoprotein, Cholesterol

• C. Glycolipids, Cholesterol, Glycoprotein

• D. Phospolipids, Cholesterol, Glycoprotein

2. 2. How many statements are correct regarding osmosis in plants?

1. * The process of water loss and the plasma membrane detaching from the cell wall is called plasmolysis

2. * Cell pressure that occurs due to the entry of water into the cell is called turgidity

3. * Condition of cells that swell and burst

4. * The process of cells shrinking due to being in a hypertonic solution is called crenation

• A. 1

• B. 2

• C. 3

• D. 4

3. 3. The following statements are correct regarding cholesterol in the structure of cell membranes

4. 1. Provides mechanical stability of membranes

5. 2. Small molecule, consists of a hydrophilic head and a hydrophobic tail

6. 3. Maintaining membran fluidity at lower temperatures

7. 4. located between phospholipids molecules

• A. 1, 2, 3, and 4

• B. 1 and 3

• C. 2 and 4

• D. 4 only

4. 4. The diagram represents part of the fluid mosaic model of a cell surface membrane. Which parts of the membrane are hydrophobic?

• A. 1, 2, and 3

• B. 2 and 3 only

• C. 3 and 4

• D. 4 only

5. 5. The diagram shows the fluid mosaic model of membrane structure

   Structures 1, 2, 3 and 4 are types of molecule.

6. What type of molecules are heterogeneous in the cell membrane?

• A. 1, 2, and 3

• B. 1 and 4

• C. 2 and 3 only

• D. 4 only

6. 6. The type of protein that transports molecules or ions across the cell membrane, against its concentration gradient, using energy from ATP is called...

• A. Protein Channel

• B. Integral Protein

• C. Carrier Protein

• D. Glycoprotein

7. 7. Look at the following picture of the osmosis experiment!

8. Which conclusion is correct?

• A. The entry of water into the potato tissue from the sugar solution causing turgidity

• B. The entry of water into the sugar solution through potato tissue causes plasmolysis to occur

• C. There is a balance of solvent and sugar concentration outside and inside the cell

• D. The entry of water into the potato tissue from the sugar solution causing hemolysis

8. 8. Which of the following is not an example of diffusion is...

• A. Ink that spreads in water

• B. Exchange of carbon dioxide and oxygen gases in the alveoli

• C. Spraying perfume into the air

• D. Carrots soaked in salt water

9. 9. The statements are comparisons of endocytosis and exocytosis.

10. * Endocytosis and exocytosis are types of bulk transport, which is the movement of large molecules

11. * Endocytosis involves taking materials into the cell, whereas exocytosis involves the

    release of materials from the cell

12. * Endocytosis and exocytosis do not require adenosine triphosphate (ATP) to move substances in and out of cells

13. * An example of endocytosis is phagocytosis and exocytosis is pinocytosis

How many statements are correct?

• A. 1

• B. 2

• C. 3

• D. 4

10. 10. Examples of ligands attached to channel proteins are...

11. 1. Ca²⁺

12. 2. ATP

13. 3. Cyclic Nucleotides

14. 4. Dopamine

• A. 1, 2, and 3

• B. 1 and 3 only

• C. 2 and 4

• D. 4 only