Chymotrypsin, trypsin, and elastase are digestive enzymes called serine proteases. the serine proteases differ in substrate specificity: chymotrypsin cleaves peptide bonds after aromatic or bulky hydrophobic side chains; trypsin requires basic amino acid residues; and elastase cleaves bonds following small uncharged side chains. a chart of amino acids can be found here. the specificity pockets (substrate-binding sites) of each of the serine proteases are drawn below.

Fossil fuels are organic compounds that are made from

Consider the story you just read. all but one of the choices below indicate that something is living.

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.