You might see the word alloy described as a mixture of metals, but that's a little bit misleading because some alloys contain only one metal and it's mixed in with other substances that are nonmetals (cast iron, for example, is an alloy made of just one metal, iron, mixed with one nonmetal, carbon).
Energy substrates in the human body are either carbohydrates, fat or proteins. Protein degradation yields amino acid residues which can be converted to carbohydrates and used in energy production. Carbohydrates (sugars) and amino acids from proteins give approximately 4 kcal/gram dry weight when burned in the body.
What is the role of an enzyme substrate complex? An enzyme-substrate complex is formed when a subtrate molecule binds with the active site of an enzyme that is of similar shape and size.n enzyme-substrate complex may be caused by the interaction of the  molecules of protein and protease. The enzyme-substrate complex is  a theory proposed in 1888 by the Swe â¦ dish chemist, Savante  Arrhenius.