The Cell Membrane: Structure and Function
A Grade 12 science worksheet focusing on the structure, function, and transport mechanisms of the cell membrane.
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The Cell Membrane: Structure and Function
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Read each question carefully and provide thorough answers. Refer to the provided diagram where necessary.
Figure 1: Cross-section of a cell membrane
1. Which component of the cell membrane is primarily responsible for its fluidity?
Glycoproteins
Cholesterol
Peripheral proteins
Phospholipid heads
2. Which type of membrane protein is involved in active transport?
Channel proteins
Carrier proteins
Receptor proteins
Enzyme proteins
3. The cell membrane is described as a model, indicating its dynamic nature and the presence of various components.
4. is the movement of water across a selectively permeable membrane from an area of high water concentration to an area of low water concentration.
5. Glycocalyx is formed by the carbohydrate chains of and on the outer surface of the cell membrane.
6. Facilitated diffusion requires energy in the form of ATP.
True
False
7. The hydrophobic tails of phospholipids face outward towards the aqueous environment.
True
False
8. Describe the main functions of the cell membrane.
9. Explain the difference between passive and active transport across the cell membrane.
Match each term on the left with its correct description on the right.
10. Phospholipid bilayer
a. Cell-to-cell recognition
11. Integral proteins
b. Main structural component
12. Glycocalyx
c. Embedded within the membrane
13. Cholesterol
d. Regulates membrane fluidity
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