Definition of implement written for English Language Learners from the Merriam-Webster Learner's Dictionary with audio pronunciations, usage examples, and count/noncount noun labels. Learner's Dictionary mobile search
Protein is composed of amino acids, which are in turn made up of mostly carbon, hydrogen, oxygen, and nitrogen. A few amino acids also contain sulfur: both Cysteine and Methionine. Thus, proteins containing these amino acids would be made up of very small amounts of sulfur, in addition to the more common elements listed above. The five chemical elements of protein are, 1.) sulfur 2.) carbon 3.) hydrogen 4.) oxygen 5.) nitrogen.
1 They may also be composed of different subunits. 2  Hemoglobin is an example of a protein with quaternary structure. 3  Hemoglobin, found in the blood, is an iron containing protein that binds oxygen molecules. 4  It contains four subunits: two alpha subunits and two beta subunits. There are two types of secondary structures observed in proteins. 2  One type is the alpha (Î±) helix structure. 3  This structure resembles a coiled spring and is secured by hydrogen bonding in the polypeptide chain.