Level 4 officials are the most experienced officials on the field and have 76 or more games under their belts at the start of the MLS season; all FIFA officials have Level 4 status. According to the 2009 MLS Referee Manual, Level 4 referees earn $875 per game, assistant referees earn $495 and fourth officials earn $285.fficials who work Major League Soccer games are paid based on experience. Referee experience is based on the number of regular-season and playoff games worked and is set in an MLS scale that is comprised of four levels.
The subunits of proteins are called amino acids. Amino acid molecules are smaller than protein molecules and are inside of the protein molecules. Amino acids are joined together by peptide bonds where the-COOH group and the-NH2 group of two consecutive amino acids bond with the loss of a water molecule.
1 What are proteins and what do they do?  What are proteins and what do they do? Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the bodyâs tissues and organs. Proteins are made up of hundreds or thousands of smaller units called amino acids, which are attached to one another in long chains.