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Exam 25: Carbohydrates

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Question 21

True/False

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The difference between the pyranose and furanose forms of a given aldohexose is the ring size.

A) True
B) False

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Question 22

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Which of the following represents a pyranose?

A) only 1
B) only 2
C) only 3
D) only 1 and 2

E) None of the above
F) B) and D)

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Question 23

Multiple Choice

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Which of the following is vitamin C?

A 1,4-α-linkage between two glucose units produces a disaccharide called maltose.

Which of the following structures represent the same carbohydrate?

There are only 2 trioses: the aldotriose 2,3-dihydroxypropanal and the ketotriose _____.

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

The textile rayon is produced by treatment of cellulose with carbon disulfide in aqueous sodium hydroxide. What type of functional group is introduced on the cellulose under these conditions?

Consider the following Fisher projections. They all convert to the same tetrahedral representation as shown below..

The name of the following Fischer projection including stereochemistry is _____________________.

Which of the following represents a furanose?

Identify the following compound. ​

The number of the anomeric carbon in the following structure is _____.

Identify the products of the following reaction. ​

Which of the following is an alditol?

Which of the following has a D-configuration?

Consider the following structures. Answer the following questions by placing the appropriate number or indicated letter in the blank. -Structure ____ represents a ketohexose.

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. -_____ is a sugar with three chirality centers.

Consider the following structures. Answer the following questions by placing the appropriate number or indicated letter in the blank. -Structure ____ represents a aldopentose.

Oxidation of optically active D-erythrose with nitric acid produces optically inactive meso-tartaric acid (below). The structure of D-erythrose is shown below.