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Questions and Answers
What is the main function of the plasma membrane?
What is the main function of the plasma membrane?
- Providing structural support to the cell
- Facilitating cellular respiration
- Exhibiting selective permeability (correct)
- Acting as a storage organelle
What are the main macromolecules in cellular membranes?
What are the main macromolecules in cellular membranes?
- Proteins and nucleic acids
- Carbohydrates and nucleic acids
- Lipids and proteins (correct)
- Carbohydrates and lipids
What type of molecules are phospholipids?
What type of molecules are phospholipids?
- Hydrophilic
- Nonpolar
- Hydrophobic
- Amphipathic (correct)
Where do most membrane proteins reside?
Where do most membrane proteins reside?
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What allows some substances to cross the plasma membrane more easily than others?
What allows some substances to cross the plasma membrane more easily than others?
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Cell membranes are impermeable and do not allow any substances to cross them.
Cell membranes are impermeable and do not allow any substances to cross them.
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The structure of plasma membrane is not influenced by the fluidity of membranes.
The structure of plasma membrane is not influenced by the fluidity of membranes.
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Passive transport does not require energy input from the cell.
Passive transport does not require energy input from the cell.
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Osmosis has no effect on water balance within the cell.
Osmosis has no effect on water balance within the cell.
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Most membrane proteins are amphipathic and reside in the bilayer with their hydrophobic portions protruding.
Most membrane proteins are amphipathic and reside in the bilayer with their hydrophobic portions protruding.
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