Dr. Kratochvil studies the structure of proteins, large molecules made up of many amino acids. Her research requires creating isotope-edited amino acids like glutamine (shown below) that are present in a protein of interest. O H-N H H-C-H H-C-H HICIN O || HH O-H i. (4 pts) What is the mass of a single molecule (in u) of natural-abundance glutamine? ii. (3 pts) In her research, Dr. Kratochvil needs a version of glutamine in which all the carbons are 3C isotopes and all the nitrogens are 15N isotopes; let's call this isotope- specific compound glutamine*. Estimate the molecular weight (in u) of glutamine". Report your answer rounded to a whole number. iii. (3 pts) Below is the mass spectrum of the natural-abundance protein that contains a single glutamine. On this same spectrum, draw and label the expected m/z peak for the protein that contains the isotope-edited glutamine*. Relative Intensity 100- 75- 50- 25- 3043 m/z m/z