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.

The only statement about monosaccharide structure which is true is b. (Monosaccharides can be classified according to the spatial arrangement of their atoms)

Explanation:

Monosaccharides are simple sugars that are classified according to the amount of carbon atoms and based on these numbers, we can call them trioses, pentoses and hexoses. They are molecules with aldehyde (aldose) or centone (ketose) groups that have more than one alcohol function, but which do not differ in their position (OH). They do not contain N, since their general formula is Cx (H2O) x. A 6-carbon monosaccharide is called hexose, since the pentose only has 5

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