Multiple Choice
Which of the following best describes the sodium-potassium ATPase?
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8. Membrane Structure
Membrane Proteins
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Integral membrane proteins are mostly involved in which of the following cellular functions?
A
Synthesizing DNA in the nucleus
B
Storing genetic information
C
Transporting molecules across the membrane
D
Producing ATP in the cytosol
Verified step by step guidance1
Understand the role of integral membrane proteins: Integral membrane proteins are embedded within the lipid bilayer of the cell membrane and often span the entire membrane. Their structure allows them to interact with both the hydrophobic core of the membrane and the aqueous environments on either side.
Review the functions of integral membrane proteins: These proteins are primarily involved in processes such as transporting molecules (ions, nutrients, and waste) across the membrane, cell signaling, and maintaining the structural integrity of the membrane.
Eliminate incorrect options: Synthesizing DNA in the nucleus and storing genetic information are functions associated with the nucleus and not the cell membrane. Producing ATP in the cytosol is primarily carried out by enzymes and pathways like glycolysis, not integral membrane proteins.
Focus on the correct function: Integral membrane proteins are crucial for transporting molecules across the membrane. They act as channels, carriers, or pumps to facilitate the movement of substances that cannot pass freely through the lipid bilayer.
Conclude: Based on the above analysis, the correct answer is that integral membrane proteins are mostly involved in transporting molecules across the membrane.
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