Cell Membrane Practice

Front

What is the fluid mosaic model of the cell membrane?

Back

The fluid mosaic model describes the cell membrane as a flexible structure with various proteins embedded in or attached to a phospholipid bilayer, resembling a mosaic.

Front

How do cells maintain homeostasis?

Back

Cells maintain homeostasis by regulating the movement of substances in and out of the cell, ensuring a stable internal environment.

Front

What role does cholesterol play in the cell membrane?

Back

Cholesterol strengthens and stabilizes the cell membrane, making it less permeable to very small water-soluble molecules that might otherwise pass freely through.

Front

What are extracellular receptors?

Back

Extracellular receptors are proteins located on the cell membrane that bind to signaling molecules (ligands) outside the cell, triggering a response inside the cell.

Front

What does hydrophobic mean in the context of cell membranes?

Back

Hydrophobic refers to the property of molecules that repel water; in cell membranes, hydrophobic regions help to form the barrier that separates the inside of the cell from the outside.

Front

What is the primary function of the cell membrane?

Back

The primary function of the cell membrane is to protect the cell and regulate the movement of substances in and out of the cell.

Front

What are phospholipids and their role in the cell membrane?

Back

Phospholipids are molecules that make up the cell membrane, consisting of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails, forming a bilayer.

Front

What is selective permeability?

Back

Selective permeability is the property of the cell membrane that allows certain substances to pass through while blocking others.

Front

How do transport proteins function in the cell membrane?

Back

Transport proteins facilitate the movement of substances across the cell membrane, either by passive transport (without energy) or active transport (requiring energy).

Front

What is the significance of membrane fluidity?

Back

Membrane fluidity is important for the proper functioning of the cell membrane, allowing for the movement of proteins and lipids, and enabling cell signaling and transport.