Discussion
A protein gives peaks at m/z 1001, 1101 and 1223. What do they represent?
Answer: D
A ladder of peaks decreasing in spacing is the classic electrospray pattern of one molecule carrying different numbers of protons, and deconvoluting it gives a single accurate molecular weight. Three proteins would not space so regularly, fragments are uncommon in electrospray, and isotope peaks differ by one unit. Recognising the charge-state envelope is what turns an apparently complex spectrum into one number. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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