11 Questions
Which of the following is NOT a function of cell membranes?
Synthesizing ATP
What is the main structural component of cell membranes?
Lipid molecules
What is the role of specialized membrane proteins in cell membranes?
Establishing ion gradients
Which type of molecules constitute about 50% of the mass of most animal cell membranes?
Lipids
What is the main function of transmembrane proteins in the plasma membrane?
Transport of specific molecules across the membrane
What is the most abundant type of membrane lipid?
Phospholipids
Which lipid molecule contains a rigid ring structure and is found in large amounts in eukaryotic plasma membranes?
Cholesterol
Which type of lipid molecules form bilayers spontaneously in aqueous environments?
Phospholipids
What is the function of lipid asymmetry in the plasma membrane?
To bind to specific lipid head groups in the cytosolic monolayer
What is the role of the enzyme protein kinase C (PKC) in the plasma membrane?
To translocate phosphatidylserine in apoptotic cells
How do phospholipids arrange themselves in a lipid bilayer?
As double-layered sheets with the hydrophobic tails sandwiched between the hydrophilic head groups
Test your knowledge on the structure and importance of cell membranes in this informative quiz. Explore the crucial role of the plasma membrane in enclosing and defining the cell, and learn about the lipid and protein molecules that make up this essential component of life.
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