Textbook Question
Where are protein components of the extracellular matrix synthesized?
a. In the rough ER
b. In the Golgi apparatus
c. In the plasma membrane
d. In the extracellular layer itself
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6. The Membrane
Types of Membrane Proteins
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Which of the following is correct regarding integral membrane proteins?
A
They are loosely bound to the surface of the membrane.
B
They are permanently attached to the lipid bilayer.
C
They can be easily removed without disrupting the membrane.
D
They are only found on the exterior surface of the cell membrane.
Verified step by step guidance1
Understand the structure of the cell membrane: The cell membrane is composed of a lipid bilayer with embedded proteins, which include integral membrane proteins and peripheral proteins.
Define integral membrane proteins: Integral membrane proteins are proteins that are permanently attached to the membrane and span across the lipid bilayer.
Differentiate between integral and peripheral proteins: Integral proteins are embedded within the lipid bilayer, whereas peripheral proteins are loosely attached to the surface and can be easily removed.
Consider the function and location of integral proteins: Integral proteins can function as channels, transporters, or receptors and are found throughout the membrane, not just on the exterior surface.
Conclude the correct statement: Based on the characteristics of integral membrane proteins, the correct statement is that they are permanently attached to the lipid bilayer.
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