Plasma Membrane Structure

Front

What is the plasma membrane?

Back

The plasma membrane is a biological membrane that separates and protects the interior of all cells from the external environment.

Front

What are the main components of the plasma membrane?

Back

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

Front

What is the function of phospholipids in the plasma membrane?

Back

Phospholipids form a bilayer that provides a barrier to most water-soluble substances, allowing selective permeability.

Front

What role do proteins play in the plasma membrane?

Back

Proteins in the plasma membrane assist in transport, act as receptors, and provide structural support.

Front

What is the difference between peripheral and integral proteins?

Back

Peripheral proteins are attached to the surface of the membrane, while integral proteins are embedded within the membrane.

Front

What is the function of cholesterol in the plasma membrane?

Back

Cholesterol helps to stabilize the fluidity of the plasma membrane, making it less permeable to very small water-soluble molecules.

Front

What are channel proteins?

Back

Channel proteins are integral proteins that allow specific molecules or ions to pass through the membrane without using energy.

Front

What is a protein pump?

Back

A protein pump is a type of transport protein that requires energy to move substances against their concentration gradient.

Front

What is selective permeability?

Back

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

Front

What is the role of carbohydrate chains in the plasma membrane?

Back

Carbohydrate chains are involved in cell recognition and signaling, often attached to proteins or lipids.