6 Questions
What is the main function of cell membranes?
To act as barriers controlling the exchange of materials between the internal and external environment.
What are the three main components of cell membranes?
Lipids, proteins, and small amounts of carbohydrates.
What is the structure of a phospholipid molecule?
A phospholipid molecule consists of a glycerol backbone attached to a negatively charged phosphate molecule and two non-polar fatty acid chains.
Why are non-polar lipid-soluble molecules, such as oxygen and carbon dioxide, able to pass through the lipid bilayer?
The hydrophobic interior of the lipid bilayer allows non-polar molecules to pass through easily.
What is the definition of simple diffusion?
The spontaneous movement of molecules down a concentration gradient from an area of higher concentration to an area of lower concentration.
What is an example of simple diffusion in the human body?
The diffusion of oxygen from the oxygen-rich air in the alveoli to the blood in the capillaries surrounding the alveoli.
Learn about the composition and structure of cell membranes, including the lipid bilayer, phospholipids, and associated molecules. Understand how membranes act as barriers controlling the exchange of materials between the internal and external environment.
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