Exam 25: Biomolecules: Carbohydrates

Exhibit 25-4 From the sugars below,choose the one that best fits each description below.Place the letter of the sugar in the blank to the left of the description.There is only one correct answer for each question. -_____ a D-sugar.

Exhibit 25-6 Refer to the sugars below to answer the following question(s).Choose the sugar that best fits each description and place the letter of the sugar in the blank to the left of the description.There is only one correct answer for each question,but sugars may be used more than once. -_____ a D-ketohexose

Consider the following structure.Atoms other than carbon and hydrogen are labeled. How many chirality centers are present?

Consider the following structure.Atoms other than carbon and hydrogen are labeled. Which of the following is not a correct classification for this substance?

Exhibit 25-10 Choose a structure from the list provided below that best fits each of the following descriptions.Place the letter of the structure in the blank to the left of the description.There is only one correct answer for each question. -_____ a monosaccharide that gives a negative Benedict's Test.

Exhibit 25-8 Draw structures for the products you would expect to obtain from reaction of β-D-galactopyranose with each of the following reagents.Be sure to include all relevant stereochemistry. β-D-galactopyranose -Br₂,H₂O

Exhibit 25-5 Refer to the equilibrium below to answer the following question(s). -Refer to Exhibit 25-5.The correct name for the cyclic structure is _______.

Examine the following molecular models.Atoms other than carbon and hydrogen are labeled. ​ ​ A B ​ ​ Which of the following correctly describes these substances?

Exhibit 25-10 Choose a structure from the list provided below that best fits each of the following descriptions.Place the letter of the structure in the blank to the left of the description.There is only one correct answer for each question. -_____ a disaccharide

Classify the following substance.Atoms other than carbon and hydrogen are labeled.

Exhibit 25-4 From the sugars below,choose the one that best fits each description below.Place the letter of the sugar in the blank to the left of the description.There is only one correct answer for each question. -_____ a deoxy sugar.

Exhibit 25-11 Consider the reaction below to answer the following question(s). -Refer to Exhibit 25-11.Which anomer is the LEAST stable? Q or Z

Exhibit 25-5 Refer to the equilibrium below to answer the following question(s). -Refer to Exhibit 25-5.Classify ribose by carbonyl type and number of carbons.

In comparing Fischer projections,which of the following are allowed rotations in the plane of the page?

Exhibit 25-9 Choose a structure from the list provided below that best fits each of the following descriptions.Place the letter of the structure in the blank to the left of the description.There is only one correct answer for each question. -_____ amylopectin

Consider the following reaction sequence. 1 ) HCN 2 ) H₂/Pd 3 ) H₃O⁺ The result of this treatment to a monosaccharides would be:

Exhibit 25-2 Label each pair of stereoisomers below as: -_____

Exhibit 25-6 Refer to the sugars below to answer the following question(s).Choose the sugar that best fits each description and place the letter of the sugar in the blank to the left of the description.There is only one correct answer for each question,but sugars may be used more than once. -_____ oxidizes to an optically inactive aldaric acid

Exhibit 25-8 Draw structures for the products you would expect to obtain from reaction of β-D-galactopyranose with each of the following reagents.Be sure to include all relevant stereochemistry. β-D-galactopyranose -(CH₃CO)₂O,pryridine

Exhibit 25-3 Refer to the monosaccharides below to answer each of the following question(s): Classify each sugar by type;for example,glucose is an aldohexose. -Refer to Exhibit 25-3.Sorbose is _____.