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Exam 14: Biomolecules: Carbohydrates

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Question 1

Multiple Choice

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Instructions: Choose a structure from the list provided below that best fits the description given. There is only one correct answer for each question. -A non-reducing disaccharide

A)
B)
C)
D)
E)
F)

G) All of the above
H) A) and D)

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D

Question 2

Multiple Choice

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Which of the following could not form a pyranose?

A) D-threose
B) D-ribose
C) D-lyxose
D) D-glucose
E) D-galactose

F) None of the above
G) A) and B)

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Question 3

Multiple Choice

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What is the relationship between D-erythrose and D-threose?

Instructions: Refer to the monosaccharides below to answer the following question(s). -Refer to instructions. Assign R or S configuration to each chirality center in sorbose.

Using the following structure of D-talose as a guide, draw the structure for $\alpha$ -D-talopyranose. Label each ring substituent as axial or equatorial.

The monosaccharide shown below is

Instructions: Refer to the monosaccharides below to answer the following question(s). Classify each sugar by type; for example, glucose is an aldohexose. a. Sorbose b. Rhamnose c. Erythrulose d. Xylulose -Refer to instructions. Sorbose is ____________________.

Instructions: From the sugars below, choose the one that best fits each of the following description(s). There is only one correct answer for each question. -a D-sugar.

Instructions: Choose a structure from the list provided below that best fits the description given. There is only one correct answer for each question. -A reducing monosaccharide

If the following compound undergoes oxidation in the presence of the appropriate enzyme, draw the structure of the likely product.

Instructions: Refer to the sugars below to answer the following question(s). Choose the sugar that best fits each description. There is only one correct answer for each question, but sugars may be used more than once. Indicate each answer by the corresponding letter. -Refer to instructions. _____ a dextrorotary hexose and ______ a levorototary tetrose.

Instructions: Refer to the monosaccharides below to answer the following question(s). -Refer to instructions. Provide the complete name for the $\alpha$ -anomer of rhamnose in its pyranose form.

How many D-ketotetroses could exist?

Instructions: Draw structures for the products you would expect to obtain from reaction of $\beta$ -D-galactopyranose with the listed reagents. Be sure to include all relevant stereochemistry. $\beta$ -D-galactopyranose -Draw: NaBH₄ in H₂O

Instructions: Consider the reaction below to answer the following question(s) . -Refer to instructions. Compound Z is:

Instructions: Consider the reaction below to answer the following question(s). -Refer to instructions. Place a triangle around the anomeric carbon in compound Q.

Instructions: Refer to D-idose below to answer the following question(s) . -Refer to instructions. The Fischer projection for D-idose (above) corresponds to which pyranose below?

Instructions: From the sugars below, choose the one that best fits each of the following description(s). There is only one correct answer for each question. -a sugar which yields a single alditol upon reduction.

Instructions: Refer to the equilibrium below to answer the following question(s). -Refer to instructions. Classify ribose by carbonyl type and number of carbons.

Instructions: Draw structures for the products you would expect to obtain from reaction of $\beta$ -D-galactopyranose with the listed reagents. Be sure to include all relevant stereochemistry. $\beta$ -D-galactopyranose -Draw: CH₃I, Ag₂O