Multiple Choice
Which process requires the use of membrane proteins?
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6. The Membrane
Types of Membrane Proteins
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Which of the following describes pore proteins in cellular membranes?
A
They serve as receptors for signaling molecules.
B
They anchor the cell membrane to the cytoskeleton.
C
They are involved in active transport of molecules against their concentration gradient.
D
They form channels that allow specific ions to pass through the membrane.
Verified step by step guidance1
Understand the role of pore proteins in cellular membranes. Pore proteins, also known as channel proteins, are integral membrane proteins that facilitate the transport of ions and molecules across the cell membrane.
Recognize that pore proteins form channels that allow specific ions to pass through the membrane. These channels are selective, meaning they only allow certain ions or molecules to pass based on size, charge, or other properties.
Differentiate pore proteins from other types of membrane proteins. For example, receptor proteins bind signaling molecules, while transport proteins may be involved in active transport, which requires energy to move substances against their concentration gradient.
Consider the mechanism of ion passage through pore proteins. Ions move through these channels by passive transport, which does not require energy, as they move down their concentration gradient.
Review the importance of pore proteins in maintaining cellular homeostasis. By regulating the flow of ions, these proteins help maintain the cell's internal environment, contributing to processes such as nerve impulse transmission and muscle contraction.
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