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Questions and Answers
What is the primary role of the hydrophilic end of the cell membrane?
What is the primary role of the hydrophilic end of the cell membrane?
- To store genetic information
- To provide structure to the cell
- To interact with water and substances soluble in water (correct)
- To prevent the entrance of all substances into the cell
Cholesterol is found exclusively in plant cell membranes.
Cholesterol is found exclusively in plant cell membranes.
False (B)
What are glycolipids primarily composed of?
What are glycolipids primarily composed of?
Sugar and lipids
Phosphatidyl-inositol consists of an inositol backbone plus _______ fatty acids and a phosphorylated alcohol.
Phosphatidyl-inositol consists of an inositol backbone plus _______ fatty acids and a phosphorylated alcohol.
What type of movement do phospholipids in the cell membrane NOT undergo?
What type of movement do phospholipids in the cell membrane NOT undergo?
Match the following terms related to cell membrane components with their descriptions:
Match the following terms related to cell membrane components with their descriptions:
Intrinsic proteins are also referred to as peripheral proteins.
Intrinsic proteins are also referred to as peripheral proteins.
What is the primary role of carbohydrates in the cell membrane?
What is the primary role of carbohydrates in the cell membrane?
Phospholipids increase in __________ of fatty acids during low environmental temperatures.
Phospholipids increase in __________ of fatty acids during low environmental temperatures.
Match the following types of cell membrane proteins with their characteristics:
Match the following types of cell membrane proteins with their characteristics:
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Study Notes
Cell Membrane Structure and Function
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The hydrophilic end of the cell membrane is primarily responsible for interacting with the aqueous environment surrounding the cell.
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Cholesterol is found exclusively in animal cell membranes, not plant cell membranes.
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Glycolipids are primarily composed of carbohydrates and lipids.
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Phosphatidyl-inositol consists of an inositol backbone plus two fatty acids and a phosphorylated alcohol.
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Phospholipids in the cell membrane do not undergo flip-flop movement, which involves the movement of a phospholipid molecule from one leaflet of the membrane to the other.
Cell Membrane Components
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Intrinsic proteins are also referred to as integral proteins, which are embedded within the lipid bilayer.
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Carbohydrates in the cell membrane play a primary role in cell recognition and signaling.
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Phospholipids increase in saturation of fatty acids during low environmental temperatures. This helps maintain membrane fluidity.
Cell Membrane Protein Types
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Channel proteins form pores through the membrane, allowing the passage of specific molecules or ions.
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Carrier proteins bind to specific molecules and transport them across the membrane.
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Receptor proteins bind to signaling molecules, triggering specific cellular responses.
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Enzymes catalyze specific reactions within the membrane or on its surface.
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Structural proteins provide support and shape to the membrane.
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