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Food Chemistry, Nutrition and Vitamins
Which of the following statement(s) is/are true?
P. Rings with five and six atoms monosaccharides are called pyranose and furanose forms, respectively.
Q. In polysaccharides, monosaccharide units are joined by peptide bond.
R. Trehalose consists of two glucose units.
The aldehyde or ketone group of a straight-chain monosaccharide will react reversibly with a hydroxyl group on a different carbon atom to form a hemiacetal or hemiketal, forming a heterocyclic ring with an oxygen bridge between two carbon atoms. Rings with five and six atoms are called furanose and pyranose forms, respectively, and exist in equilibrium with the straight-chain form. In polysaccharides, monosaccharide units are joined by glycosidic bond. Trehalose is a disaccharide and consists of two glucose monomeric units.
Hence, only statement R is true.