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Q. Which of the following statements about monosaccharide structure is true?
  • A. Aldoses and ketoses differ in the position of their hydroxyl groups.
  • B. Monosaccharides can be classified according to the spatial arrangement of their atoms.
  • C. All monosaccharides contain carbon, hydrogen, oxygen, and nitrogen atoms.
  • D. A six-carbon sugar is called a pentose.