Podcast
Questions and Answers
What is the main composition of the plasma membrane in human red blood cells?
What is the main composition of the plasma membrane in human red blood cells?
- 70% lipid, 30% protein
- 55% protein, 45% lipid
- 60% protein, 40% lipid (correct)
- 50% protein, 50% lipid
Which model of the plasma membrane was proposed in 1935?
Which model of the plasma membrane was proposed in 1935?
- Freeze-fracture model
- Hybrid model
- Sandwich model (Davson/Danielli) (correct)
- Fluid Mosaic Model
According to the Fluid Mosaic Model, what does 'fluid' refer to?
According to the Fluid Mosaic Model, what does 'fluid' refer to?
- Complete rigidity of the membrane
- Constant movement of proteins
- Membrane held together by weak interactions (correct)
- Highly variable lipid composition
Which method revealed the structure of the membrane's interior?
Which method revealed the structure of the membrane's interior?
What is the percentage of cholesterol in the plasma membrane of human red blood cells?
What is the percentage of cholesterol in the plasma membrane of human red blood cells?
Which structure is responsible for keeping hydrophilic molecules out of the cell?
Which structure is responsible for keeping hydrophilic molecules out of the cell?
What is the primary function of glycolipids and glycoproteins in the cell membrane?
What is the primary function of glycolipids and glycoproteins in the cell membrane?
In which type of transport do carrier proteins change shape to translocate the solute-binding site across the membrane?
In which type of transport do carrier proteins change shape to translocate the solute-binding site across the membrane?
What is the main requirement for active transport to occur?
What is the main requirement for active transport to occur?
Which process involves the fusion of vesicles with the cell membrane to expel contents?
Which process involves the fusion of vesicles with the cell membrane to expel contents?
Which component of the plasma membrane is responsible for keeping hydrophilic and hydrophobic molecules organized in a bilayer?
Which component of the plasma membrane is responsible for keeping hydrophilic and hydrophobic molecules organized in a bilayer?
What is the significance of the freeze-fracture method in understanding the structure of the plasma membrane?
What is the significance of the freeze-fracture method in understanding the structure of the plasma membrane?
In the context of cell communication, what role do glycolipids play in the plasma membrane?
In the context of cell communication, what role do glycolipids play in the plasma membrane?
What feature of the Fluid Mosaic Model contributes to the membrane's ability to change shape and adapt to different cellular activities?
What feature of the Fluid Mosaic Model contributes to the membrane's ability to change shape and adapt to different cellular activities?
Which type of membrane protein requires energy (ATP) for its function?
Which type of membrane protein requires energy (ATP) for its function?
In the context of cell signaling, which stage involves the activation of a cellular response?
In the context of cell signaling, which stage involves the activation of a cellular response?
What is the function of aquaporins in the cell membrane?
What is the function of aquaporins in the cell membrane?
Which process involves the diffusion of H2O down its concentration gradient?
Which process involves the diffusion of H2O down its concentration gradient?
What is the primary function of glycolipids and glycoproteins in the cell membrane?
What is the primary function of glycolipids and glycoproteins in the cell membrane?
Which structure is responsible for maintaining the hydrophobic barrier of the cell membrane?
Which structure is responsible for maintaining the hydrophobic barrier of the cell membrane?
What is the main mechanism by which CO2, N2, and O2 molecules are transported across the cell membrane?
What is the main mechanism by which CO2, N2, and O2 molecules are transported across the cell membrane?
Which type of transport involves substances moving against their concentration gradient?
Which type of transport involves substances moving against their concentration gradient?
'Phagocytosis' is best described as:
'Phagocytosis' is best described as:
'Ligands bind to specific receptors on the cell surface' is a characteristic of which type of endocytosis?
'Ligands bind to specific receptors on the cell surface' is a characteristic of which type of endocytosis?
'Direct or indirect' and 'Requires specific membrane proteins' are characteristics of which type of active transport?
'Direct or indirect' and 'Requires specific membrane proteins' are characteristics of which type of active transport?
What type of proteins have a hydrophobic interior and hydrophilic ends?
What type of proteins have a hydrophobic interior and hydrophilic ends?
