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Exam 21: Biomolecules: Carbohydrates

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Question 1

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Consider the reaction below to answer the following question(s). -Refer to instructions. Which anomer is the LEAST stable? Q or Z

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Z

Question 2

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Refer to the equilibrium below to answer the following question(s). -Refer to instructions. Which enantiomer of ribose is drawn, D or L, and is it the α or β anomer?

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Question 3

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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. -Draw the structure of the product of the following reaction.

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

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. Erythrulose is ____________________.

The brick-red color observed when Benedict's test is applied to D-mannose is due to

Convert the Fischer projections into tetrahedral representations, and assign R or S stereochemistry to each. -Convert and assign:

Choose a structure from the list provided below that best fits the description given. There is only one correct answer for each question. -A 1,4' β-glycoside

Aldohexoses may exist as furanoses or pyranoses. Aldopentoses also may exist as furanoses or pyranoses. a)Draw Haworth projections for a furanose and a pyranose obtained from D-ribose. b)Each product can exist in two anomeric forms. What is the structural difference between these forms?

Which reagent would be best suited for the transformation shown?

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

The monosaccharide shown below is

Convert the Fischer projections into tetrahedral representations, and assign R or S stereochemistry to each. -Describe the fundamental difference between the following classifications of carbohydrates. a. monosaccharide, disaccharide, polysaccharide b. simple sugar, complex sugar c. ketose, aldose d. furanose, pyranose

Consider the reaction below to answer the following question(s) . -Refer to instructions. Q and Z are cyclic examples of:

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

Which of the following could not form a pyranose?

Draw structures for the products you would expect to obtain from reaction of β-D-galactopyranose with the listed reagents. Be sure to include all relevant stereochemistry. β-D-galactopyranose -Draw: Ch₃I, Ag₂O

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 ketose and _____ an aldose with two chirality centers

Refer to the monosaccharides below to answer the following question(s). a. Sorbose b. Rhamnose c. Erythrulose d. Xylulose -Convert the following Fisher projections into tetrahedral representations.

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