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Questions and Answers
Which type of substances can pass directly through the membrane?
Which type of substances can pass directly through the membrane?
- Nutrients
- Ions
- Hydrophilic solutes
- Lipid-soluble substances (correct)
What is the main function of plasma membranes?
What is the main function of plasma membranes?
- Generate energy through the activity of membrane transport proteins
- Control the passage of ions and small organic molecules (correct)
- Provide surfaces for the attachment of receptors
- Act as sites for the attachment of enzymes only
Which organelles are enclosed by a double-membrane system?
Which organelles are enclosed by a double-membrane system?
- Lysosomes
- Peroxisomes
- Mitochondria (correct)
- Golgi apparatus
What is the function of non-membranous structures in the cytosol?
What is the function of non-membranous structures in the cytosol?
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Which component determines general cell shape and supports specialized extensions of the cell surface?
Which component determines general cell shape and supports specialized extensions of the cell surface?
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What is the total thickness of the plasma membrane?
What is the total thickness of the plasma membrane?
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In the electron microscope, how do membranes appear in section?
In the electron microscope, how do membranes appear in section?
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Where do freeze-fracture cleavage planes usually pass along?
Where do freeze-fracture cleavage planes usually pass along?
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What do intramembranous particles embedded in the lipid bilayer represent?
What do intramembranous particles embedded in the lipid bilayer represent?
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Where are intramembranous particles mainly distributed in plasma membranes?
Where are intramembranous particles mainly distributed in plasma membranes?
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