Protiens

Protiens Laboratory Report Section 3.1-Test for Proteins A protein is a long chain of amino acids that are linked from end to end by peptide bonds. The function and shape of the protein are determined by the sequence of its twenty amino acids. Proteins perform different functions in a cell. For example, regulatory proteins regulate, or control, cellular metabolism. Hemoglobin carries oxygen and carbon dioxide through the red blood cells of vertebrates and through the plasma of invertebrates, and transport proteins simply move substances from one region of the body to the next. Enzymes are also proteins that are capable of speeding up specific chemical reactions. In this experiment, we are testing for the presence of proteins, or either peptides. The Biuret test was used in this experiment, because the reagent will change color in the presence of proteins or peptides. In the presence of proteins, the reagent will turn purple, and if there are peptides, the reagent will turn pinkish-purple. The hypothesis is in fact that a protein can contain one or more polypeptide chains, which are very long chains of amino acids. In this particular experiment some of the equipment used is a solution, proteins, test, presence, reagent, protein, mark, first, chains, tube, polypeptides, polypeptide, experiment, albumin, purple, present, peptides, pepsin, different, biuret, amino, acids, water, tubes, starch, one, four, filled, chain, amount, very, two, through, solutions, second