Portage Biochemistry- Module 4 Questions with
Complete Reliable Solutions
Is the following molecule an aldose or ketose? Briefly explain. - Answer ketose. There is a C=O on the
third carbon from the top.
Which carbon in erythrose would tell you if the monosaccharide is D or L? Give the carbon's number in
your answer. - Answer On carbon number 3, which is the penultimate carbon.
Glucose and mannose are epimers. Name another epimer of glucose besides mannose. - Answer
Galactose
Is the following structure a D or L carbohydrate? Briefly explain. - Answer L. The -OH group is on the left
side on the penultimate carbon.
Does the compound C7H14O8 fit the formal definition of a carbohydrate? Explain. - Answer No. This
compound has does not fit the formula CnH2nOn as indicated in the module. There is one additional
oxygen in this compound.
Which of the following is carbon number 3? (Indicate by the appropriate letter.) - Answer C
Which carbon in this molecule is the anomeric carbon? (Indicate by the appropriate letter.) - Answer A
Is the following a furan or pyran ring? Briefly explain. - Answer furan. There are only five atoms in the
ring: one oxygen and four carbons.
When is the alpha 1→6 connection typically found in carbohydrates? - Answer The alpha 1→6 bond is
found in polysaccharides when branching occurs.
Is the following an alpha 1→4 or beta 1→4 connection? Briefly explain. - Answer This is a beta 1→4
because the molecule on the left has the oxygen in the up, or beta, position.
, What are the similarities and differences between amylose and amylopectin? Explain in at least three
complete sentences. - Answer Similarities: Both of are homopolysaccharides of glucose. They each have
alpha 1 → 4 connections between glucose. They each are part of starch.
Differences: Amylopectin has branching with alpha 1→6 linkages. Amylose does not. Amylopectin is
typically larger than amylose.
How is chitin different from cellulose? - Answer Chitin has glucose with derivatives attached. -NH-CO-
CH3 is connected to each glucose.
Where are alpha 1 → 6 bonds found in carbohydrates? - Answer They are found where glycogen and
amylopectin branch.
In what ways are amylose and a protein alike? - Answer They both can form alpha helices.
What is the name of the carbohydrate found in beetle exoskeleton? - Answer Chitin
Which of the following monosaccharides is a ketose?
Dihydroxyacetone
Galactose
Glucose
Glyceraldehyde
Idose - Answer Dihydroxyacetone
When two monosaccharides are epimers:
They differ only in the configuration about one carbon atom
One is a furanose, the other a pyranose
One is an aldose, the other a ketose
They can form ring structures
They form O-glycosidic bonds - Answer They differ only in the configuration about one carbon atom
Complete Reliable Solutions
Is the following molecule an aldose or ketose? Briefly explain. - Answer ketose. There is a C=O on the
third carbon from the top.
Which carbon in erythrose would tell you if the monosaccharide is D or L? Give the carbon's number in
your answer. - Answer On carbon number 3, which is the penultimate carbon.
Glucose and mannose are epimers. Name another epimer of glucose besides mannose. - Answer
Galactose
Is the following structure a D or L carbohydrate? Briefly explain. - Answer L. The -OH group is on the left
side on the penultimate carbon.
Does the compound C7H14O8 fit the formal definition of a carbohydrate? Explain. - Answer No. This
compound has does not fit the formula CnH2nOn as indicated in the module. There is one additional
oxygen in this compound.
Which of the following is carbon number 3? (Indicate by the appropriate letter.) - Answer C
Which carbon in this molecule is the anomeric carbon? (Indicate by the appropriate letter.) - Answer A
Is the following a furan or pyran ring? Briefly explain. - Answer furan. There are only five atoms in the
ring: one oxygen and four carbons.
When is the alpha 1→6 connection typically found in carbohydrates? - Answer The alpha 1→6 bond is
found in polysaccharides when branching occurs.
Is the following an alpha 1→4 or beta 1→4 connection? Briefly explain. - Answer This is a beta 1→4
because the molecule on the left has the oxygen in the up, or beta, position.
, What are the similarities and differences between amylose and amylopectin? Explain in at least three
complete sentences. - Answer Similarities: Both of are homopolysaccharides of glucose. They each have
alpha 1 → 4 connections between glucose. They each are part of starch.
Differences: Amylopectin has branching with alpha 1→6 linkages. Amylose does not. Amylopectin is
typically larger than amylose.
How is chitin different from cellulose? - Answer Chitin has glucose with derivatives attached. -NH-CO-
CH3 is connected to each glucose.
Where are alpha 1 → 6 bonds found in carbohydrates? - Answer They are found where glycogen and
amylopectin branch.
In what ways are amylose and a protein alike? - Answer They both can form alpha helices.
What is the name of the carbohydrate found in beetle exoskeleton? - Answer Chitin
Which of the following monosaccharides is a ketose?
Dihydroxyacetone
Galactose
Glucose
Glyceraldehyde
Idose - Answer Dihydroxyacetone
When two monosaccharides are epimers:
They differ only in the configuration about one carbon atom
One is a furanose, the other a pyranose
One is an aldose, the other a ketose
They can form ring structures
They form O-glycosidic bonds - Answer They differ only in the configuration about one carbon atom
