30 Questions
Which of the following is NOT a component of the cell membrane?
Nucleic acids
What percentage of the mass of most animal cell membranes is made up of lipids?
50%
What is the main function of transmembrane proteins in the cell membrane?
Transport molecules across the membrane
Which type of lipids are the most abundant in cell membranes?
Phospholipids
What is the characteristic appearance of cell membranes when viewed in cross-section?
Three-layer structure
Which organelle is responsible for fatty acid oxidation for energy production?
Mitochondrial membrane
What is the main function of the cell membrane?
Separates the cellular interior from the exterior
Which process involves the merging of two separate lipid bilayers into one?
Membrane fusion
What is the main function of the Golgi apparatus membrane?
Coordination of different reactions
Which organelle is responsible for the formation of vesicles to transport lipids and proteins?
ER membrane
Which of the following is NOT a function of cell membranes?
Serving as attachment surface for cytoskeleton and ECS
What is the main role of membrane proteins?
Regulating the movement of material into and out of the cell
What is the composition of the lipid bilayer in cell membranes?
Lipids
What is the purpose of cell membrane visualization techniques?
To study the structure and function of cell membranes
What is the role of the plasma membrane in eukaryotic cells?
Compartmentalization to segregate processes and compartments
Which type of cell membrane contains the highest percentage of proteins?
Liver cell (Mouse)
Which type of cell membrane contains the highest percentage of lipids?
Erythrocytes (Human)
Which type of cell membrane contains the highest percentage of carbohydrates?
Liver cell (Rat)
What is the main function of the cell wall in prokaryotic cells?
To provide mechanical stability
Why do phospholipid bilayers spontaneously form sealed compartments?
To prevent the exposure of hydrophobic tails to water
Which type of lipids are found in the inner and outer layers of the cell membrane?
Phospholipids
What is the major phospholipid found in mammalian plasma membranes?
Phosphatidylcholine
Which layer of the cell membrane is closer to the extracellular space?
Outer membrane layer
Which layer of the cell membrane is closer to the intracellular space (cytoplasm)?
Inner membrane layer
What is the term for the unequal distribution of phospholipids, other lipids, and membrane proteins between the inner and outer layers of the cell membrane?
Asymmetry
Which technique provides views of surfaces inside the cell?
Freeze-etch electron microscopy
What is the main purpose of the freeze-fracture technique?
To visualize the internal organization of membranes
Which type of electron microscopy is used to visualize the cell's nucleus?
Transmission electron microscopy
What is the function of lysosomes in a cell?
To digest foreign particles
Which phospholipid carries a net negative charge in the plasma membrane of mammalian cells?
Phosphatidylserine
Test your knowledge of cell membranes with this quiz! Learn about the composition of various cell membranes, including lipids, proteins, and carbohydrates. Compare the differences between the nuclear membrane, liver cells, erythrocytes, and mitochondrial membranes. Discover the variations between prokaryotic and eukaryotic cell membranes.
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