Multiple Choice
Which of the following are the three main subclasses of membrane receptors?
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6. The Membrane
Types of Membrane Proteins
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Which of the following is a primary function of membrane proteins?
A
Synthesis of DNA
B
Storage of genetic information
C
Transport of molecules across the membrane
D
Production of ribosomes
Verified step by step guidance1
Understand the role of membrane proteins: Membrane proteins are integral or peripheral proteins embedded in or associated with the lipid bilayer of the cell membrane. Their primary functions are related to the cell's interaction with its environment, including transport, signaling, and structural support.
Eliminate unrelated options: Synthesis of DNA and storage of genetic information are functions associated with the nucleus and DNA, not membrane proteins. Similarly, the production of ribosomes occurs in the nucleolus, not in the membrane.
Focus on transport: One of the key roles of membrane proteins is to facilitate the movement of molecules across the cell membrane. This includes channel proteins and carrier proteins that help in passive or active transport of ions, nutrients, and other substances.
Relate to the lipid bilayer: The lipid bilayer is selectively permeable, meaning it restricts the free movement of many molecules. Membrane proteins help overcome this barrier by providing specific pathways for molecules to enter or exit the cell.
Conclude the primary function: Based on the options provided, the correct answer is 'Transport of molecules across the membrane,' as this is a fundamental role of membrane proteins in maintaining cellular homeostasis.
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