Multiple Choice
Which type of membrane proteins can span the lipid bilayer and facilitate transport across the membrane?
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6. The Membrane
Types of Membrane Proteins
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What purpose do transmembrane proteins serve in the cell membrane?
A
They provide structural support to the cell membrane.
B
They are involved in the synthesis of lipids.
C
They act as channels or transporters for molecules across the membrane.
D
They function as enzymes for intracellular reactions.
Verified step by step guidance1
Understand the structure of the cell membrane: The cell membrane is composed of a phospholipid bilayer with embedded proteins, including transmembrane proteins.
Identify the role of transmembrane proteins: These proteins span the entire membrane and are crucial for transporting molecules across the membrane.
Differentiate between types of transmembrane proteins: Some act as channels, allowing specific molecules or ions to pass through, while others function as transporters, actively moving substances across the membrane.
Consider the importance of selective permeability: Transmembrane proteins contribute to the cell membrane's selective permeability, which is essential for maintaining homeostasis by regulating the internal environment of the cell.
Recognize other functions of transmembrane proteins: Besides transport, they can also serve as receptors for signal transduction, linking the external environment to the cell's internal processes.
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