Multiple Choice
Which of the following secondary structures is most commonly found in membrane proteins?
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8. Membrane Structure
Membrane Proteins
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Why does the cell membrane contain transport proteins?
A
To facilitate the movement of specific molecules across the membrane that cannot pass through the lipid bilayer directly.
B
To store genetic information within the membrane.
C
To provide structural support to the cell membrane.
D
To synthesize ATP for cellular energy.
Verified step by step guidance1
Understand the structure of the cell membrane: The cell membrane is primarily composed of a phospholipid bilayer, which is selectively permeable. This means that only certain molecules, such as small nonpolar molecules, can pass through it directly.
Recognize the role of transport proteins: Transport proteins are embedded within the cell membrane and are responsible for facilitating the movement of molecules that cannot diffuse through the lipid bilayer, such as ions, polar molecules, and large molecules.
Eliminate incorrect options: Analyze the other options provided. The cell membrane does not store genetic information (this is the role of the nucleus), provide structural support (this is primarily the role of the cytoskeleton), or synthesize ATP (this is the role of mitochondria).
Focus on the correct function: Transport proteins are essential for processes like facilitated diffusion and active transport, which allow specific molecules to cross the membrane efficiently and selectively.
Conclude the reasoning: The correct answer is that transport proteins facilitate the movement of specific molecules across the membrane that cannot pass through the lipid bilayer directly, ensuring proper cellular function.
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