All of the statements concerning monosaccharides are correct except
A) the number of stereoisomers possible is 2n,where n is the number of chiral carbon atoms in the molecule.
B) monosaccharides with 5 or 6 carbon atoms exist in solution in cyclic form.
C) the two different cyclic forms of a particular monosaccharide are called tautomers.
D) a molecule is classified as a D or L isomer by the position of the hydroxyl group on the chiral center farthest from the carbonyl group.
E) monosaccharides have the general formula Cn(H2O) n,but this only describes the number and kinds of atoms,not their structure.
Correct Answer:
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Q20: α-D-glucose and β-D-glucose are
A)enantiomers.
B)anomers.
C)disaccharides.
D)a racemic mixture.
E)polysaccharides.
Q21: A hemiacetal linkage consists of a
A)carbon atom
Q22: All of the following are common monosaccharides
Q29: When a monosaccharide forms a cyclic hemiacetal,the
Q42: The reaction of a simple sugar with
Q45: Ketoses can act as reducing sugars in
Q50: _ of glucose leads to gluconic acid.
A)Oxidation
B)Reduction
C)Isomerization
D)Glycosidation
E)Esterification
Q51: Common reducing reactions of monosaccharides are due
Q53: The bond connecting the two monosaccharides in
Q60: Which molecule is not a reducing sugar?
A)lactose
B)maltose
C)sucrose
D)glucose
E)galactose
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