22 Questions
Which term is another name for the cell membrane?
Plasmalemma
What is the thickness of the cell membrane?
7.5 nm
What is the main function of the cell membrane?
All of the above
Which of the following is a major determinant of membrane fluidity?
Cholesterol content
What did Gorter and Grendel discover about the organization of lipids in biological membranes?
Lipids are organized in a bilayer
Which model proposed a layer of protein on both sides of the lipid bilayer?
The Danielli-Davson Model
According to the text, what do liposomes closely resemble in structure?
Cell membranes
Which of the following is NOT a characteristic of cell membrane lipid bilayers?
They allow large hydrophilic molecules to pass through by diffusion
What is the function of phospholipids in cell signaling?
They create docking sites for intracellular signaling proteins
Which lipid is negatively charged and creates a significant difference in charge between the two halves of the lipid bilayer?
Phosphatidyl serine
Which process allows lipids to move from one monolayer to the other in the lipid bilayer?
Flip-flop
Which of the following is NOT a function of the cell membrane?
Regulating the traffic of ions and macromolecules
What is the primary structure of biological membranes?
Lipid bilayer
How can the presence of the cell membrane be demonstrated?
Through physiological experiments
Which model proposed the concept of membrane asymmetry?
Singer 1971 Fluid mosaic model
What is the most abundant type of lipid in the cell membrane?
Phosphatidyl choline
Which enzyme is activated during programmed cell death to expose phosphatidylserine on the outer monolayer of the cell membrane?
Scramblase
Which process allows lipids to move within a monolayer of the lipid bilayer?
Lateral diffusion
Which of the following is NOT a factor affecting the fluidity of cell membranes?
Phospholipid concentration
What was the major finding of Gorter and Grendel's study on the organization of lipids in biological membranes?
Lipids are organized in a bilayer
Which model proposed a layer of protein on both sides of the lipid bilayer?
The Danielli-Davson Model
What is the function of liposomes in medicine and pharmacology?
To encapsulate hydrophilic drugs
Test your knowledge on the cell membrane in medical biology! Learn about the structure, function, and presence of the plasma membrane. Explore how it can be demonstrated through physiological experiments.
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