Exam 14: Biomolecules: Carbohydrates

Instructions: 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 $\alpha$ or $\beta$ anomer?

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 with three chirality centers.

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. Erythrulose is ____________________.

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 1,4' $\beta$ -glycoside

Which reagent would be best suited for the transformation shown?

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. _____ oxidizes to an optically inactive aldaric acid.

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

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 deoxy sugar.

Draw an aldopentose with S,S,R stereochemistries at its carbons 2 through 4.

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 ketose and _____ an aldose with two chirality centers

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: (CH₃CO)O₂, pryridine

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

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

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

Which of the following has a D-configuration?

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

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: Br₂, H₂O

Instructions: Refer to the monosaccharides below to answer the following question(s). -Convert the following Fisher projections into tetrahedral representations.

Instructions: Refer to the monosaccharides below to answer the following question(s). -Refer to instructions. Draw both chair conformations of the $\alpha$ -anomer of rhamnose in its pyranose form. Circle the more stable conformation.

Which of the following is a disaccharide?