Consider one turn or loop in your Phenylalanine hydroxylase. What are important amino acids that contribute to this partof the structure?

Some enzymes can be regulated by covalent modification, in which a group is covalently bonded to an amino acid side chain. Phosphorylation of side chains is a common regulatory covalent modification. In this essay, you will explore phosphorylation of side chains.  Compare and contrast the types of interactions a free alcohol side chain such as serine could make with that of a phosphorylated alcohol such as phosphoserine (pSer). Could this modification affect the 3D structure of the protein? How?  Imagine you are trying to separate a protein containing an unphosphorylated S residue from the same protein containing a pSer residue. Discuss how you could use ion-exchange chromatography to separate these two proteins

Explain the primary, secondary, tetriary and quaternary structure of glutathione reductase protein.

In order to metabolize lactose, most infants express the enzyme lactase in their intestines.   What kind of glycosidic linkage does lactose have? Please draw the individual monosaccharides to explain your answer.   Please explain how the monosaccharides in lactose will be used in glycolysis. Be specific.