25 Questions
What is the primary function of the plasma membrane in maintaining homeostasis?
It helps regulate the concentration of solutes within the cell.
According to the fluid mosaic model, what is the characteristic of the cell membrane that allows it to move with the cell?
Its fluid and flexible nature
What is the term used to describe the internal environment of the cell?
Cytoplasm
Who described the fluid mosaic model of the cell membrane in 1972?
S.J. Singer and Garth L. Nicolson
What is the primary function of the phosphate group in a phospholipid molecule?
To create a negatively charged head
What is the main component of the cell membrane that provides structural support?
Phospholipids
What is the role of cholesterol in the cell membrane?
To regulate fluidity in the membrane
What is the primary function of proteins in the cell membrane?
To facilitate cellular communication
What is the term used to describe the external environment of the cell?
Extracellular space
What is the main function of proteins that span the membrane as transmembrane proteins?
To regulate the movement of large molecules
What is the fluid mosaic model of the cell membrane compared to?
A dynamic, fluid mosaic
What is the purpose of carbohydrates in the cell membrane?
To aid in cell-to-cell adhesion
What is the term for the property of the cell membrane that allows certain molecules to pass through while restricting others?
Selective permeability
What is the term for molecules that contain both hydrophobic and hydrophilic parts?
Amphipathic
What is the function of proteins that serve as pumps in the cell membrane?
To spend energy to move molecules
What is the term for the phospholipid arrangement in the cell membrane?
Phospholipid bilayer
What is the primary function of phospholipids in the cell membrane?
To form a tight barrier to regulate permeability of the membrane
Which component of the cell membrane is responsible for regulating membrane fluidity?
Cholesterol
What is the term for the ability of the cell membrane to regulate what enters and exits the cell?
Selective permeability
Which component of the cell membrane is amphipathic?
Phospholipids
What is the main component of the cell membrane?
Phospholipids
What is the function of proteins embedded in the cell membrane?
To regulate cellular communication, cell adhesion, transport and more
What is the term for the model that describes the fluid and flexible nature of the cell membrane?
The fluid mosaic model
What is the function of carbohydrates attached to proteins and lipids outside the cell?
To regulate cell adhesion and recognition
What is the analogy used to describe the components of the cell membrane?
A mosaic
Learn about the fluid mosaic model, which describes the structure and function of the cell membrane. This model explains how different parts of the membrane move and work together to maintain the cell's integrity and functionality.
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