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75.
Which of the following pairs of D-aldohexoses would produce the same product when
subjected to Wohl degradation?
A)
D-glucose & D-galactose
B)
D-mannose & D-galactose
C)
D-glucose & D-gulose
D)
D-allose & D-altrose
E)
D-glucose & D-allose
76.
D-mannose when subjected to Wohl degradation followed by Br2/H2O produces the
same aldonic acid as does______ when treated with Br2/H2O.
A)
D-arabinose
B)
D-ribose
C)
D-xylose
D)
D-lyxose
E)
D-threose
77.
An optically active D-aldohexose was treated with NaBH4/H2O it produced an optically
inactive alditol. When the same D-aldohexose was subjected to Wohl degradation
followed by HNO3 it produced an optically inactive aldaric acid. Provide the structure of
this D-aldohexose.
78.
When an optically active D-aldopentose was subjected to Kiliani-Fischer synthesis,
followed by NaBH4/H2O, it produced a mixture of an optically active and inactive
alditols. When the same D-aldopentose was subjected to Wohl degradation followed by
HNO3 it produced an optically inactive aldaric acid. Provide the structure of this D-
aldopentose.
79.
Which one of the following is a correct structure for maltose?
O
HO
HO
O
OH
OH
O
HO
OH
OH
OH
O
OH
HO
OH
OH
O
O
HO
OH
OH
OH
O
HO
HO
OH
OH
O
HO
OH
OH
OH
O
O
HO
OH
OH
O
HO
OH
OH
OH
O
OH
III
III IV
A)
I
B)
II
C)
III
D)
IV
E)
none of these
80.
Which one of the following is a correct structure for lactose?
O
HO
HO
O
OH
OH
O
HO
OH
OH
OH
O
OH
HO
OH
OH
O
O
HO
OH
OH
O
HO
HO
OH
OH
O
HO
OH
OH
OH
O
III
III
O
HO
O
OH
OH
OH
O
HO
OH
OH
OH
IV
OH
A)
I
B)
II
C)
III
D)
IV
E)
none of these
81.
Which one of the following is a correct structure for sucrose?
O
HO
HO
O
OH
OH
O
HO
OH
OH
OH
O
OH
HO
OH
OH
O
O
HO
OH
OH
OH
III
III
IV
O
HO
HO
O
OH
OH
O
CH2OH
OH
OH
CH2OH
O
HO
HO
OH
OH
O
CH2OH
OH
OH
CH2OH
O
A)
I
B)
II
C)
III
D)
IV
E)
none of these
82.
Which one of the following is a correct structure for cellobiose?
O
HO
HO
O
OH
OH
O
HO
OH
OH
OH
II
O
HO
O
OH
OH
OH
O
HO
OH
OH
OH
IV
O
HO
OH
OH
O
O
HO
OH
OH
I
OH
HO
O
HO
HO
OH
OH
O
HO
OH
OH
OH
O
III
A)
I
B)
II
C)
III
D)
IV
E)
none of these
83.
Which of the following disaccharides is a reducing sugar?
O
HO
HO
O
OH
OH
O
HO
OCH3
OH
OH
O
OH
HO
OH
OH
O
O
HO
OH
OH
OH
III
III
IV
O
HO
HO
O
OH
OH
O
CH2OH
OH
OH
CH2OH
O
HO
HO
OH
OH
O
O
CH2OH
OH
OH
CH2OH
A)
I
B)
II
C)
III
D)
IV
E)
none of these
84.
Which of the following statement(s) best describe the main difference between maltose
and cellobiose?
A)
maltose has -1-4 glycosidic linkage and cellobiose has -1-4 glycosidic linkage
B)
maltose is comprised of -D-glucopyranose and cellobiose is comprised of -D-
glucopyranose
C)
maltose is comprised of -D-glucopyranose and cellobiose is comprised of -D-
glucopyranose
D)
maltose has -1-4 glycosidic linkage and cellobiose has -1-4 glycosidic linkage
E)
C & D
85.
Which of the following is a reducing sugar with a → −glycosidic linkage?
A)
maltose
B)
cellobiose
C)
sucrose
D)
lactose
E)
B & D
86.
Which of the following would reduce Fehling solution?
A)
maltose
B)
cellobiose
C)
sucrose
D)
lactose
E)
A, B & D
87.
Predict the product(s) when lactose is treated with Br2/H2O.
88.
Predict the product(s) when maltose is treated with NaBH4/H2O.
89.
Predict the product(s) when maltose is treated with CH3OH/HCl.
90.
Predict the product(s) when cellobiose is treated with excess acetic anhydride/pyridine.
92.
Which of the following monosaccharide(s) are produced when starch is completely
hydrolyzed?
A)
-D-glucose
B)
-D-glucose
C)
-D-galactose
D)
-D-fructose
E)
maltose
93.
Which of the following monosaccharide(s) are produced when cellulose is completely
hydrolyzed?
A)
-D-glucose
B)
-D-glucose
C)
-D-galactose
D)
-D-fructose
E)
maltose
94.
Which of the following monosaccharide(s) are produced when glycogen is completely
hydrolyzed?
A)
-D-glucose
B)
-D-glucose
C)
-D-galactose
D)
-D-fructose
E)
maltose
95.
The main difference between cellulose and chitin is that:
A)
Cellulose has -glycosidic linkages; chitin has -glycosidic linkages
B)
Cellulose has -glycosidic linkages; chitin has -glycosidic linkages
C)
Cellulose contains D-glucose units; chitin contains N-acetyl derivative of glucosamine
D)
Cellulose has a linear structure, chitin has helical structure
E)
Cellulose has 1,6 branching, chitin has no branching
96.
Raffinose is a trisaccharide found in whole grains. What is the correct description of the
glycosidic linkage(s) in Raffinose?
A)
1→6 at galactose and glucose & 1→1 at glucose and fructose
B)
1→4 at galactose and glucose & 1→1 at glucose and fructose
C)
1→6 at galactose and glucose & 1→6 at glucose and fructose
D)
1→6 at galactose and glucose & 1→1 at glucose and fructose
E)
1→4 at galactose and glucose & 1→1 at glucose and fructose
97.
Raffinose is a trisaccharide found in whole grains. Is Raffinose a reducing sugar?
A)
yes
B)
no
98.
Which one of the following heterocyclic amines is not a base in DNA?
A)
uracil
B)
thymine
C)
cytosine
D)
adenine
E)
guanine
99.
Which one of the following heterocyclic amines is not a base in RNA?
A)
uracil
B)
thymine
C)
cytosine
D)
adenine
E)
guanine
100.
What is the difference between a nucleoside and a nucleotide?
A)
nucleotide is a phosphorylated nucleoside
B)
nucleoside is a phosphorylated nucleotide
C)
nucleotide is a deoxynucleoside
D)
nucleoside is a deoxynucleotide
E)
none of these
101.
Predict the product(s) when a-D-glucose is treated with methanamine in presence of
acid.
102.
Provide the structure for cytidine.
103.
Provide the structure for uridine.
