CHEM 210 Module 4 Exam Newest
1. Which carbon in erythrose would tell you if the monosaccharide is D or L?Give the
carbon's number in your answer. ANS On carbon number 3, which is the penultimate
carbon.
2. Glucose and mannose are epimers. Name another epimer of glucose be-sides
mannose. ANS galactose
3. Does the compound C7H14O8 fit the formal definition of a carbohydrate? Explain. ANS
No. This compound has does not fit the formula CnH2nOn as indicated inthe module. There
is one additional oxygen in this compound.
4. When is the ± 1’c6onnection typically found in carbohydrates? ANS The ± 1’6
bond is found
in polysaccharides when branching occurs.
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, 5. What are the similarities and differences between amylose and amy- lopectin? Explain
in at least three complete sentences. ANS Similarities Both of are homopolysaccharides
of glucose. They each have ± 1 ’ 4connections between glucose. They each are part of
starch.
Differences Amylopectin has branching with ± 1’6linkages. Amylose does not. Amy- lopectin
is typically larger than amylose.
6. How is chitin different from cellulose? ANS Chitin has glucose with derivatives
attached. -NH-CO-CH3 is connected to each glucose.
7. Where are ± 1 ’ 6
bonds found in carbohydrates? ANS They are found where
glycogen and amylopectin branch.
8. In what ways are amylose and a protein alike? ANS They both can form alphahelices.
9. What is the name of the carbohydrate found in beetle exoskeleton? ANS chitin
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1. Which carbon in erythrose would tell you if the monosaccharide is D or L?Give the
carbon's number in your answer. ANS On carbon number 3, which is the penultimate
carbon.
2. Glucose and mannose are epimers. Name another epimer of glucose be-sides
mannose. ANS galactose
3. Does the compound C7H14O8 fit the formal definition of a carbohydrate? Explain. ANS
No. This compound has does not fit the formula CnH2nOn as indicated inthe module. There
is one additional oxygen in this compound.
4. When is the ± 1’c6onnection typically found in carbohydrates? ANS The ± 1’6
bond is found
in polysaccharides when branching occurs.
1/3
, 5. What are the similarities and differences between amylose and amy- lopectin? Explain
in at least three complete sentences. ANS Similarities Both of are homopolysaccharides
of glucose. They each have ± 1 ’ 4connections between glucose. They each are part of
starch.
Differences Amylopectin has branching with ± 1’6linkages. Amylose does not. Amy- lopectin
is typically larger than amylose.
6. How is chitin different from cellulose? ANS Chitin has glucose with derivatives
attached. -NH-CO-CH3 is connected to each glucose.
7. Where are ± 1 ’ 6
bonds found in carbohydrates? ANS They are found where
glycogen and amylopectin branch.
8. In what ways are amylose and a protein alike? ANS They both can form alphahelices.
9. What is the name of the carbohydrate found in beetle exoskeleton? ANS chitin
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