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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?
- Enclosing the cell and defining its boundaries (correct)
- Maintaining the characteristic differences between organelles and cytosol
- Creating a barrier that is permeable to most water-soluble molecules
- Determining the size and shape of the cell
What is the common general structure of biological membranes?
What is the common general structure of biological membranes?
- A continuous single layer of lipid molecules
- A thin film of lipid and protein molecules held together mainly by non-covalent interactions (correct)
- A rigid and non-dynamic structure with fixed molecules
- A double layer of lipid and protein molecules held together by covalent interactions
What distinguishes the functions of cytomembranes in eukaryotic cells?
What distinguishes the functions of cytomembranes in eukaryotic cells?
- They determine the size and shape of the cell
- They are impermeable to most water-soluble molecules
- They maintain the characteristic differences between the contents of each organelle and the cytosol (correct)
- They enclose the cell and define its boundaries
What is a key characteristic of cell membranes?
What is a key characteristic of cell membranes?
Which type of molecules do lipid layers serve as a barrier to?
Which type of molecules do lipid layers serve as a barrier to?
What is a function of biological membranes?
What is a function of biological membranes?
What is the function of protein molecules that span the lipid bilayer in the membrane?
What is the function of protein molecules that span the lipid bilayer in the membrane?
What is the mean thickness of the plasma membrane as defined by the electron microscope (EM)?
What is the mean thickness of the plasma membrane as defined by the electron microscope (EM)?
What covers the outer side of the plasma membrane in animal eukaryotic cells?
What covers the outer side of the plasma membrane in animal eukaryotic cells?
What is the chemical composition of a plasma membrane isolated and purified from red blood cells (RBC)?
What is the chemical composition of a plasma membrane isolated and purified from red blood cells (RBC)?
What are the main components of the membrane lipids found in the plasma membrane?
What are the main components of the membrane lipids found in the plasma membrane?
Which molecule forms the framework (bilayer) of the membrane and is the most numerous of the membrane lipids?
Which molecule forms the framework (bilayer) of the membrane and is the most numerous of the membrane lipids?
What are the main phospholipids observed in the plasma membrane of mammals?
What are the main phospholipids observed in the plasma membrane of mammals?
In terms of chemical composition, how do cytomembranes differ from plasma membranes?
In terms of chemical composition, how do cytomembranes differ from plasma membranes?
What are amphiphilic molecules in the context of membrane lipids?
What are amphiphilic molecules in the context of membrane lipids?
What characterizes phospholipids and sterols found in the plasma membrane?
What characterizes phospholipids and sterols found in the plasma membrane?
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