Functions of the Plasma Membrane Quiz

Cell Membrane Structure and Function

• The lipid bilayer is a crucial component of the cell membrane, providing a semi-permeable or selectively permeable barrier that regulates the flow of materials into and out of the cell.

Cell Membrane Permeability

• Cell membranes are referred to as semi-permeable or selectively permeable because they allow certain substances to pass through while restricting others, ensuring a controlled environment within the cell.

Protein Function on the Plasma Membrane

• Proteins on the plasma membrane play a crucial role in cell-cell interactions, facilitating communication and adhesion between cells.

Cell Membrane Structure

• The cell membrane is described as a lipid bilayer, comprising two layers of lipid molecules with their hydrophilic heads facing outward and hydrophobic tails facing inward.

Glycoproteins and Lipid Proteins

• Glycoproteins are differentiated from lipid proteins on the plasma membrane by the presence of carbohydrate molecules (glycans) attached to their protein core, which play a crucial role in cell-cell interactions and signaling.

Lipid Bilayer Function

• The primary function of the lipid bilayer is to regulate the flow of materials into and out of the cell, maintaining a stable internal environment.

Plasma Membrane Function

• The plasma membrane provides a fixed environment inside the cell by regulating the flow of materials, maintaining cellular homeostasis, and facilitating cellular interactions.

Lipid Bilayer Permeability

• The lipid bilayer is considered semi-permeable because it allows certain substances to pass through while restricting others, ensuring a controlled environment within the cell.