One purpose of feedback inhibition is to prevent too much of the product from being made. Feedback inhibition balances production of amino acids, the building blocks of proteins. For example, the enzyme threonine deaminase is inhibited by one of its products: the amino acid isoleucine.
A temporary magnet created when current flows through wire wrapped in coils around an iron bar. Heat Energy The movement of thermal energy from warmer to cooler objects.
Electromagnets produce magnetic fields only when electricity travels through their wire coils. Iron filings (right) align along the magnetic field lines of a cubical neodymium magnet. Until recently, all magnets were made from metal elements or alloys. These materials produced magnets of different strengths. For example: 1  Ceramic magnets, like the ones used in refrigerator magnets and elementary-school science experiments, contain iron oxide in a ceramic composite.