Cell Membranes

Front

What is the hydrophobic region of the cell membrane?

Back

The hydrophobic region of the cell membrane is primarily composed of the fatty acid tails of phospholipids, which repel water and create a barrier to most water-soluble substances.

Front

What is a phospholipid composed of?

Back

A phospholipid is composed of a phosphate and glycerol head and two fatty acid chain tails.

Front

What does it mean for a membrane to be selectively permeable?

Back

A selectively permeable membrane allows some molecules to cross while preventing others from doing so.

Front

What role do carbohydrates play in cell membranes?

Back

Carbohydrates act as recognition sites on the cell membrane, functioning like ID tags that help cells identify each other.

Front

How does cholesterol affect 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 the main components of the cell membrane?

Back

The main components of the cell membrane are phospholipids, proteins, carbohydrates, and cholesterol.

Front

What is the fluid mosaic model?

Back

The fluid mosaic model describes the structure of the cell membrane as a mosaic of various components (lipids, proteins, carbohydrates) that move freely within the layer, allowing for flexibility and dynamic interactions.

Front

What is the function of membrane proteins?

Back

Membrane proteins serve various functions including transport, acting as channels or carriers, and facilitating communication between the cell and its environment.

Front

What is the significance of the phospholipid bilayer?

Back

The phospholipid bilayer forms the fundamental structure of the cell membrane, providing a barrier that separates the interior of the cell from the external environment.

Front

How do proteins in the cell membrane contribute to its function?

Back

Proteins in the cell membrane contribute to its function by facilitating transport, acting as receptors for signaling molecules, and providing structural support.