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A 0.2g sample of amylopectin was analyzed to determine the fraction of the total glucose residues that are branch points in the structure. The sample was exhaustively methylated and then digested, yielding 50 micromoles of 2,3-dimethylglucose and 0.4 micromoles of 1,2,3,6-tetramethulglucose. A) What fraction of the total residues are branch points? B) How many reducing ends does this amylopectin have?

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