CHEM 210 BIOCHEMISTRY MODULE 4
EXAM PORTAGE BIOCHEMISTRY- MODULE
4 QUESTIONS AND ANSWERS ALREADY
PASSED 2025 LATEST!!
1. Is the following molecule an aldose or ketose? Briefly explain.
Answer ketose. There is a C=O on the third carbon from the top.
2. 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.
3. Glucose and mannose are epimers. Name another epimer of glucose besides
mannose.
Answer Galactose
4. 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.
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,5. 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.
6. Which of the following is carbon number 3? (Indicate by the appropriate
letter.)
Answer C
7. Which carbon in this molecule is the anomeric carbon? (Indicate by the
appropriate letter.)
Answer A
8. Is the following a furan or pyran ring? Briefly explain.Answer furan. There are only five
atoms in the ringone oxygen and four carbons.
9. When is the alpha 1’6 connection typically found in carbohydrates?
Answer The alpha 1’6 bond is found in polysaccharides when branching occurs.
10. Is the following an alpha 1’4 or beta 1’4 connection? Briefly explain.
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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.
11. 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.
Ditterences: Amylopectin has branching with alpha 1’6 linkages. Amylose does not. Amylopectin is typically larger than
amylose.
12. How is chitin different from cellulose?Answer Chitin has glucose with derivatives attached. -NH-
CO-CH3 is connected to each glucose.
13. Where are alpha 1 ’6 bonds found in carbohydrates?Answer They are found where
glycogen and amylopectin branch.
14. In what ways are amylose and a protein alike?
Answer They both can form alpha helices.
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EXAM PORTAGE BIOCHEMISTRY- MODULE
4 QUESTIONS AND ANSWERS ALREADY
PASSED 2025 LATEST!!
1. Is the following molecule an aldose or ketose? Briefly explain.
Answer ketose. There is a C=O on the third carbon from the top.
2. 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.
3. Glucose and mannose are epimers. Name another epimer of glucose besides
mannose.
Answer Galactose
4. 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.
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19
,5. 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.
6. Which of the following is carbon number 3? (Indicate by the appropriate
letter.)
Answer C
7. Which carbon in this molecule is the anomeric carbon? (Indicate by the
appropriate letter.)
Answer A
8. Is the following a furan or pyran ring? Briefly explain.Answer furan. There are only five
atoms in the ringone oxygen and four carbons.
9. When is the alpha 1’6 connection typically found in carbohydrates?
Answer The alpha 1’6 bond is found in polysaccharides when branching occurs.
10. Is the following an alpha 1’4 or beta 1’4 connection? Briefly explain.
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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.
11. 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.
Ditterences: Amylopectin has branching with alpha 1’6 linkages. Amylose does not. Amylopectin is typically larger than
amylose.
12. How is chitin different from cellulose?Answer Chitin has glucose with derivatives attached. -NH-
CO-CH3 is connected to each glucose.
13. Where are alpha 1 ’6 bonds found in carbohydrates?Answer They are found where
glycogen and amylopectin branch.
14. In what ways are amylose and a protein alike?
Answer They both can form alpha helices.
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19
