3.2.1 Fluid Mosaic Model

• What model describes the structure of the cell membrane?

  Fluid mosaic model
• The phospholipid bilayer is arranged with hydrophilic heads facing outward
• Cholesterol regulates membrane fluidity by stabilizing it at different temperatures.
• Match the membrane component with its function:

  Glycoproteins ↔️ Recognition markers

  Glycolipids ↔️ Cell communication

  Cholesterol ↔️ Regulates fluidity
• What type of protein spans the entire cell membrane?

  Integral protein
• The fluid mosaic model creates a dynamic and fluid membrane.
• The hydrophobic tails of phospholipids point outward in the bilayer.

  False
• What are the two types of proteins in the fluid mosaic model?

  Integral and peripheral
• The hydrophilic heads of phospholipids interact with water in their environment.
• The fluid mosaic model describes the membrane as a static structure.

  False
• What provides the structural backbone of the cell membrane?

  Phospholipid bilayer
• What is the role of phospholipids in the cell membrane?

  Form a selectively permeable barrier
• The fluid mosaic model allows components of the membrane to move freely.
• Cholesterol is embedded between phospholipids to regulate membrane fluidity
• The fluid nature of the cell membrane enhances its flexibility and function.
• Cholesterol is embedded between phospholipids to regulate membrane fluidity
• The fluid mosaic model describes the cell membrane as a static structure.

  False
• What are the two components of a phospholipid molecule?

  Hydrophilic head and hydrophobic tail
• Cholesterol is embedded between phospholipids to regulate membrane fluidity
• Glycoproteins and glycolipids aid in cell communication and adhesion.
• What type of molecule forms the basic structure of the cell membrane?

  Phospholipid
• The hydrophilic heads of phospholipids interact with water
• Match the protein function with its type:

  Transport ↔️ Channel or carrier proteins

  Signaling ↔️ Receptor proteins

  Structural support ↔️ Structural proteins
• Cholesterol makes the cell membrane more rigid at low temperatures.

  False
• What is the effect of cholesterol on membrane fluidity at high temperatures?

  Reduces fluidity
• Membrane fluidity is essential for processes such as cell signaling, transport, and membrane repair
• What is the role of membrane fluidity in cellular processes?

  Enables movement of components
• Membrane fluidity allows for processes such as cell signaling, transport, and membrane repair
• Match the level of membrane fluidity with its effect on cellular functions:

  High Fluidity ↔️ Enhances signaling and transport

  Low Fluidity ↔️ Reduces permeability
• Cholesterol stabilizes the phospholipid bilayer at different temperatures to maintain optimal membrane fluidity.
• At low temperatures, cholesterol prevents the membrane from becoming too rigid
• What is the basic structural component of the cell membrane?

  Phospholipid bilayer
• The hydrophilic heads of phospholipids face outward in the phospholipid bilayer.
• What role does cholesterol play in the cell membrane?

  Regulates membrane fluidity
• Integral proteins embedded within the phospholipid bilayer are involved in transport and signaling
• Why is the fluid nature of the cell membrane important?

  Enhances flexibility and function
• Match the cell membrane component with its function:

  Phospholipid Bilayer ↔️ Provides structure

  Cholesterol ↔️ Regulates fluidity

  Integral Proteins ↔️ Transport and signaling

  Glycoproteins ↔️ Cell recognition
• The fluid mosaic model describes the cell membrane as a static and rigid structure.

  False
• What part of the phospholipid bilayer is hydrophobic?

  Hydrocarbon tails
• Cholesterol regulates membrane fluidity and stability