Exam 21: Biomolecules: Carbohydrates

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. _____ oxidizes to an optically inactive aldaric acid.

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

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

Refer to the monosaccharides below to answer the following question(s). a. Sorbose b. Rhamnose c. Erythrulose d. Xylulose -Refer to instructions. Draw both chair conformations of the α-anomer of rhamnose in its pyranose form. Circle the more stable conformation.

Refer to the equilibrium below to answer the following question(s). -Refer to instructions. The correct name for the cyclic structure is____.

Refer to the carbohydrate below to answer the following questions. a)Which carbon in the carbohydrate is the anomeric carbon? b)What would be observed on the addition of Tollen's reagent to a solution of this sugar?

Refer to the monosaccharides below to answer the following question(s). a. Sorbose b. Rhamnose c. Erythrulose d. Xylulose -Refer to instructions. Assign R or S configuration to each chirality center in sorbose.

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

How many D-ketotetroses could exist?