26 Questions
What is the main composition of the plasma membrane in human red blood cells?
60% protein, 40% lipid
Which model of the plasma membrane was proposed in 1935?
Sandwich model (Davson/Danielli)
According to the Fluid Mosaic Model, what does 'fluid' refer to?
Membrane held together by weak interactions
Which method revealed the structure of the membrane's interior?
Freeze-fracture method
What is the percentage of cholesterol in the plasma membrane of human red blood cells?
25%
Which structure is responsible for keeping hydrophilic molecules out of the cell?
Phospholipid bilayer
What is the primary function of glycolipids and glycoproteins in the cell membrane?
Cell-cell recognition
In which type of transport do carrier proteins change shape to translocate the solute-binding site across the membrane?
Facilitated diffusion
What is the main requirement for active transport to occur?
Specific membrane proteins
Which process involves the fusion of vesicles with the cell membrane to expel contents?
Exocytosis
Which component of the plasma membrane is responsible for keeping hydrophilic and hydrophobic molecules organized in a bilayer?
Phospholipids
What is the significance of the freeze-fracture method in understanding the structure of the plasma membrane?
It provided insights into the interior structure of the membrane
In the context of cell communication, what role do glycolipids play in the plasma membrane?
Facilitate cell adhesion and recognition
What feature of the Fluid Mosaic Model contributes to the membrane's ability to change shape and adapt to different cellular activities?
Dynamic movement of phospholipids
Which type of membrane protein requires energy (ATP) for its function?
Transmembrane proteins
In the context of cell signaling, which stage involves the activation of a cellular response?
Response
What is the function of aquaporins in the cell membrane?
Transport of water molecules
Which process involves the diffusion of H2O down its concentration gradient?
Osmosis
What is the primary function of glycolipids and glycoproteins in the cell membrane?
Cell-cell recognition
Which structure is responsible for maintaining the hydrophobic barrier of the cell membrane?
Phospholipids bilayer
What is the main mechanism by which CO2, N2, and O2 molecules are transported across the cell membrane?
Facilitated diffusion
Which type of transport involves substances moving against their concentration gradient?
Active transport
'Phagocytosis' is best described as:
'Cellular eating' of solids
'Ligands bind to specific receptors on the cell surface' is a characteristic of which type of endocytosis?
'Receptor-mediated endocytosis'
'Direct or indirect' and 'Requires specific membrane proteins' are characteristics of which type of active transport?
'Indirect active transport'
What type of proteins have a hydrophobic interior and hydrophilic ends?
Integral Proteins (Transmembrane protein)
Test your knowledge about the cell membrane and cell communication, including the study methods and models of the plasma membrane, its structure and function, movement of substances through the membrane, and cell communication processes.
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