10 Questions
Which type of substances can pass directly through the membrane?
Lipid-soluble substances
What is the main function of plasma membranes?
Control the passage of ions and small organic molecules
Which organelles are enclosed by a double-membrane system?
Mitochondria
What is the function of non-membranous structures in the cytosol?
Support specialized extensions of the cell surface
Which component determines general cell shape and supports specialized extensions of the cell surface?
Filamentous protein networks
What is the total thickness of the plasma membrane?
15 nm
In the electron microscope, how do membranes appear in section?
As two densely stained layers separated by an electron-translucent zone
Where do freeze-fracture cleavage planes usually pass along?
The hydrophobic portion of the bilayer
What do intramembranous particles embedded in the lipid bilayer represent?
Large transmembrane protein molecules or complexes of proteins
Where are intramembranous particles mainly distributed in plasma membranes?
Adhering more to the protoplasmic face (PF)
Test your knowledge on the structure and composition of cell membranes, including the arrangement of proteins, lipids, and carbohydrates. Explore the characteristics of the classic unit membrane and its overall thickness.
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