Multiple Choice
Which of the following is one of the main functions of the membrane's phospholipid bilayer?
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2. Cell Chemistry & Cell Components
Biological Membranes
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Which of the following is a property of the plasma membrane?
A
It is composed entirely of carbohydrates.
B
It is rigid and inflexible.
C
It allows all substances to pass freely.
D
It is selectively permeable.
Verified step by step guidance1
Understand the structure of the plasma membrane: The plasma membrane is primarily composed of a phospholipid bilayer, which includes proteins, lipids, and carbohydrates, but not entirely carbohydrates.
Recognize the flexibility of the plasma membrane: The membrane is not rigid; it is fluid and flexible, allowing for movement and changes in shape.
Identify the permeability of the plasma membrane: The plasma membrane does not allow all substances to pass freely; it regulates the movement of substances in and out of the cell.
Define selective permeability: Selective permeability means the plasma membrane allows certain molecules or ions to pass through it by means of active or passive transport.
Conclude with the correct property: The plasma membrane is selectively permeable, which is essential for maintaining homeostasis within the cell.
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