$$\text{Up-Lefting: Groups on the left in Fischer are up in Haworth}$$

$$\text{A five-membered ring with the ketone at C-2}$$

$$\text{The OH group on the anomeric carbon (C-1) is up}$$

$$\text{A five-membered ring with an aldehyde at C-1}$$

Question 1

Which of the following monosaccharides is classified as an aldohexose?

Accepted Answer

D-Glucose

Question 2

What is the structural difference between D-glucose and D-mannose?

Accepted Answer

They differ at carbon 2 (C-2), making them epimers.

Question 3

Which of the following is a ketopentose?

Accepted Answer

D-Ribulose

Question 4

Which equation correctly represents the conversion of a Fischer projection to a Haworth projection for a pyranose ring?

Accepted Answer

$$	ext{Up-Lefting: Groups on the left in Fischer are up in Haworth}$$

Question 5

Which of the following pairs are anomers?

Accepted Answer

α-D-Glucose and β-D-Glucose

Question 6

Which monosaccharide is a sweet-tasting sugar and is an epimer of D-glucose?

Accepted Answer

D-Mannose

Question 7

Which of the following is the correct structure for D-fructose in its furanose form?

Accepted Answer

$$	ext{A five-membered ring with the ketone at C-2}$$

Question 8

Which of the following is NOT a common aldotriose found in nature?

Accepted Answer

Dihydroxyacetone

Question 9

Which of the following statements about cyclic forms of monosaccharides is correct?

Accepted Answer

The anomeric carbon is the carbonyl carbon that becomes chiral upon ring formation.

Question 10

Which of the following pairs are enantiomers?

Accepted Answer

D-Glucose and L-Glucose

Question 11

Which of the following is a ketotriose?

Accepted Answer

Dihydroxyacetone

Question 12

Which of the following is the correct formula for the number of possible stereoisomers of an aldohexose?

Accepted Answer

$$2^n$$, where $$n is $$the number of chiral centers

Question 13

Which of the following sugars is a deoxysugar?

Accepted Answer

D-Deoxyribose

Question 14

Which of the following is true about the relationship between D-glucose and D-galactose?

Accepted Answer

They are epimers at carbon 4 (C-4).

Question 15

Which of the following is the correct Haworth projection for β-D-glucopyranose?

Accepted Answer

$$	ext{The OH group on the anomeric carbon (C-1) is up}$$

Question 16

Which of the following is a correct statement about the sweetness of D-mannose compared to D-glucose?

Accepted Answer

D-mannose tastes bitter, while D-glucose is sweet.

Question 17

Which of the following is the correct structure for D-ribose in its furanose form?

Accepted Answer

$$	ext{A five-membered ring with an aldehyde at C-1}$$

Question 18

Which of the following is true about the cyclic forms of monosaccharides?

Accepted Answer

Pyranose rings contain six atoms, while furanose rings contain five atoms.

Question 19

Which of the following is a correct example of an aldose-ketose pair?

Accepted Answer

D-Glucose and D-Fructose

Common Monosaccharides: Structures, Isomerism, and Cyclic Forms

Study Guide - Practice Questions