Which of the following is not a function of membrane proteins?

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Question in focus: which statement is not a function of membrane proteins?
Option 1: 'They determine the fluidity of the membrane' — this is not a typical function of membrane proteins. Membrane fluidity is mainly influenced by lipid composition (such as saturated vs. unsaturated fatty acids) and cholesterol content, not by proteins themselves. While proteins can interact with lipids, they do not regulate the physical state of the lipid bilayer as a primary role. So this claim is inaccurate as a primary function.
Option 2: 'They serve as channels' — many membrane proteins form channels or pores that allow specific ions or molecules to cross the membrane. This is a well-established function, so this option correctly describes a membrane protein role.
Option 3: 'They serve as receptor sites' — a large class of membrane proteins function as receptors, binding signaling molecules and transmitting information into the cell. This is a fundamental membrane protein function, so this choice is true.
Option 4: 'They serve as carriers' — some membrane proteins act as carrier or transport proteins, undergoing conformational changes to shuttle substances across the membrane. This is another core membrane protein function, so this option is also true.

ANSC20001_2025_SM1 Week 2 - The plasma membrane and membrane potential (Example MCQs)

Which of the following is not a function of membrane proteins?

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