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Questions and Answers
What is the arrangement of the phospholipid bilayer in the plasma membrane like?
What is the arrangement of the phospholipid bilayer in the plasma membrane like?
- A sandwich with hydrophilic heads aligned on the outer surfaces and hydrophobic tails forming a central layer (correct)
- An alternating pattern of hydrophilic and hydrophobic layers
- A single layer with both hydrophilic and hydrophobic properties
- A random mix of hydrophilic and hydrophobic layers
What is the structure of the plasma membrane primarily composed of?
What is the structure of the plasma membrane primarily composed of?
- Multiple layers of cholesterol and phospholipids
- A single layer of phospholipids with embedded proteins and sugars
- A layer of cholesterol with embedded proteins and sugars
- Two layers of phospholipids with embedded proteins and sugars (correct)
What role do some membrane proteins play in terms of cell identity?
What role do some membrane proteins play in terms of cell identity?
- Act as enzymes for various cellular processes
- Provide channels for passage of substances across the membrane
- Act as receptors for hormones and other chemical messengers (correct)
- Attach to the outside of the cell, giving it immunological identity
What is the main difference between hydrophilic and hydrophobic parts of phospholipid molecules?
What is the main difference between hydrophilic and hydrophobic parts of phospholipid molecules?
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What is the function of cholesterol in the plasma membrane?
What is the function of cholesterol in the plasma membrane?
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