Cellmembrane and function

Worksheet chapter-5 Cellmembrane and function

I. Choose the correct answer: (0.25 points each)

1. Channel proteins that allow water to pass through them are called _________

a. Glycoprotein’s c. Aqua proteins

b. Gap junctions d. Desmosomes

2. Osmosis means ___________________________.

a. Movement of water c. movement of solute

b. Movement of solution d. neither of them

3. If a cell is placed in a Isotonic solution, the cell will _________

a. swell c. shrink

b. remain the same d. none of the above

4. If a cell is placed in a hypotonic solution, the cell will ___ _____

a. swell c. shrink

b. remain the same d. none of the above

5. The fluid mosaic membrane describes the membrane as

a. containing a huge quantity of water in the interior

b. composed of fluid phospholipids on outside and proteins on inside

c. composed on protein outside and fluid phospholipid inside

d. made of proteins and lipids that can freely move

6. Which of the following is not a mechanism for bringing material into the cell?

a. Exocytosis c. Pinocytosis

b. Endocytosis d. Phagocytosis

7. Which of these types of cellular transport requires energy

a. facilitated diffusion c. osmosis

b. Active transport d. a and b

8. What chemical property characterizes the interior of the phospholipid bilayer

a. It is hydrophobic c. IT is polar

b.it is hydrophilic d.it is saturated

9. If someone at the other end of a restaurant smokes a cigarette, you may breathe in some smoke. The movement of smoke is similar to what type of transport.

a. osmosis c. diffusion

b. facilitated diffusion d. active transport

10. plasma membrane is made up of a ________

a. lipid layer c. lipid bilayer

b. phospholipid layer d. phospholipid bilayer

II. Answer whether true or false: (0.25 points each)

1. Diffusion is movement of water from a region of low concentration to a region of high concentration. ( )

2. If phagocytosis means eating solid particles, pinocytosis means drinking solid particles. ( )

3. In plant, cell to cell connection is due to the presence of plamodesmata. ( )

4. A membrane that allows certain things to pass through it and prevents certain things to pass is called permeable membrane. ( )

5. Gradient means a physical difference such as temperature, pressure, concentration etc between two regions. ( )

III. Choose any three questions and Write any four differences between them (each question 1 point).

1. Identify the picture and explain the process in few points

2. The picture shows human red blood cell in different solutions. Explain what happens to the cell in each solution

3. Active transport and passive transport

4.Simple diffusion and facilitated diffusion

5.Define hypotonic, hypertonic, and isotonic. What would be the fate of an animal cell immersed in each of these three types of solution?

6. Briefly write about the structure and function of plasma membrane.