10. The electrospray mass spectrum of an unknown protein consists of a series of clusters of
peaks arising from intact molecular ions with different charge. One cluster has peaks at
m/z 961.63, 961.83, 962.02 (tallest peak), 962.22, 962.41 Da. These peaks correspond to
isotopic ions differing by 1 Da. From the observed peak separation, find the charge of
the ions in this cluster, and from m/z of the tallest peak, estimate the molecular weight
(MW) of the protein.
(A) +1； 962.5 Da； (B) +2； 1924.0 Da； (C) +33 2886.1 Da； (D) +4；3848.1 Da,
(E) +5； 4810.1 Da
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