Portage Biochemistry- Module 4 Exam with ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
precise detailed answers ||\\//|| ||\\//||
Is the following molecule an aldose or ketose? Briefly explain. - correct answer✔✔ketose.
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There is a C=O on the third carbon from the top.
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Which carbon in erythrose would tell you if the monosaccharide is D or L? Give the carbon's
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number in your answer. - correct answer✔✔On carbon number 3, which is the penultimate
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carbon.
Glucose and mannose are epimers. Name another epimer of glucose besides mannose. -
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correct answer✔✔Galactose ||\\//||
Is the following structure a D or L carbohydrate? Briefly explain. - correct answer✔✔L. The -
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OH group is on the left side on the penultimate carbon.
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Does the compound C7H14O8 fit the formal definition of a carbohydrate? Explain. - correct
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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.) - correct
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answer✔✔C
Which carbon in this molecule is the anomeric carbon? (Indicate by the appropriate letter.) -
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correct answer✔✔A ||\\//||
Is the following a furan or pyran ring? Briefly explain. - correct answer✔✔furan. There are
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only five atoms in the ring: one oxygen and four carbons.
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, When is the alpha 1→6 connection typically found in carbohydrates? - correct answer✔✔The
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alpha 1→6 bond is found in polysaccharides when branching occurs.
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Is the following an alpha 1→4 or beta 1→4 connection? Briefly explain. - correct
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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
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least three complete sentences. - correct answer✔✔Similarities: Both of are
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homopolysaccharides of glucose. They each have alpha 1 → 4 connections between glucose. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
They each are part of starch.
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Differences: Amylopectin has branching with alpha 1→6 linkages. Amylose does not. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Amylopectin is typically larger than amylose. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
How is chitin different from cellulose? - correct answer✔✔Chitin has glucose with derivatives
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attached. -NH-CO-CH3 is connected to each glucose.
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Where are alpha 1 → 6 bonds found in carbohydrates? - correct answer✔✔They are found
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where glycogen and amylopectin branch. ||\\//|| ||\\//|| ||\\//|| ||\\//||
In what ways are amylose and a protein alike? - correct answer✔✔They both can form alpha
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helices.
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What is the name of the carbohydrate found in beetle exoskeleton? - correct
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answer✔✔Chitin
Which of the following monosaccharides is a ketose?
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Dihydroxyacetone
Galactose
precise detailed answers ||\\//|| ||\\//||
Is the following molecule an aldose or ketose? Briefly explain. - correct answer✔✔ketose.
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There is a C=O on the third carbon from the top.
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Which carbon in erythrose would tell you if the monosaccharide is D or L? Give the carbon's
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number in your answer. - correct answer✔✔On carbon number 3, which is the penultimate
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carbon.
Glucose and mannose are epimers. Name another epimer of glucose besides mannose. -
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correct answer✔✔Galactose ||\\//||
Is the following structure a D or L carbohydrate? Briefly explain. - correct answer✔✔L. The -
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OH group is on the left side on the penultimate carbon.
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Does the compound C7H14O8 fit the formal definition of a carbohydrate? Explain. - correct
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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.) - correct
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answer✔✔C
Which carbon in this molecule is the anomeric carbon? (Indicate by the appropriate letter.) -
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correct answer✔✔A ||\\//||
Is the following a furan or pyran ring? Briefly explain. - correct answer✔✔furan. There are
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only five atoms in the ring: one oxygen and four carbons.
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, When is the alpha 1→6 connection typically found in carbohydrates? - correct answer✔✔The
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alpha 1→6 bond is found in polysaccharides when branching occurs.
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Is the following an alpha 1→4 or beta 1→4 connection? Briefly explain. - correct
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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
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least three complete sentences. - correct answer✔✔Similarities: Both of are
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homopolysaccharides of glucose. They each have alpha 1 → 4 connections between glucose. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
They each are part of starch.
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Differences: Amylopectin has branching with alpha 1→6 linkages. Amylose does not. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
Amylopectin is typically larger than amylose. ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
How is chitin different from cellulose? - correct answer✔✔Chitin has glucose with derivatives
||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//|| ||\\//||
attached. -NH-CO-CH3 is connected to each glucose.
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Where are alpha 1 → 6 bonds found in carbohydrates? - correct answer✔✔They are found
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where glycogen and amylopectin branch. ||\\//|| ||\\//|| ||\\//|| ||\\//||
In what ways are amylose and a protein alike? - correct answer✔✔They both can form alpha
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helices.
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What is the name of the carbohydrate found in beetle exoskeleton? - correct
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answer✔✔Chitin
Which of the following monosaccharides is a ketose?
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Dihydroxyacetone
Galactose
