Question 1

Which of the following best describes the difference between an aldose and a ketose monosaccharide?

Accepted Answer

Aldoses contain an aldehyde group, while ketoses contain a ketone group.

Question 2

Which of the following is NOT a function of carbohydrates in biological systems?

Accepted Answer

Catalysis of biochemical reactions

Question 3

A sugar with the formula $C_5H_{10}O_5$ is classified as which of the following?

Accepted Answer

A pentose

Question 4

Which of the following statements about enantiomers is CORRECT?

Accepted Answer

Enantiomers are nonsuperimposable mirror images.

Question 5

Which of the following best describes an epimer?

Accepted Answer

A stereoisomer that differs in configuration at only one specific carbon atom

Question 6

Which of the following is TRUE regarding the formation of glycosidic bonds in disaccharides?

Accepted Answer

The reaction involves the elimination of water and requires activation, such as by UDP-galactose.

Question 7

Which of the following is a correct abbreviation for the glycosidic linkage in sucrose?

Accepted Answer

$\alpha$-D-Glcp(1 \rightarrow 2)-\beta$-D-Fruf

Question 8

Which of the following statements about polysaccharides is CORRECT?

Accepted Answer

Glycogen is a homopolysaccharide with more frequent and shorter branches than amylopectin.

Question 9

Which of the following is a structural polysaccharide found in the exoskeleton of arthropods and some fungi?

Accepted Answer

Chitin

Question 10

Which of the following best describes the difference between anomeric and epimeric forms of glucose?

Accepted Answer

Anomers differ at the anomeric carbon, while epimers differ at any carbon except the anomeric carbon.

Question 11

Which of the following is a correct statement about glycosaminoglycans?

Accepted Answer

They are polymers of repeating disaccharide units and serve as lubricants and structural components in connective tissues.

Question 12

Which of the following is a product of the reduction of D-glucose?

Accepted Answer

D-glucitol (sorbitol)

Question 13

Which of the following is TRUE about the structure and function of cellulose?

Accepted Answer

It is a linear polymer of glucose with $\beta(1 \rightarrow 4)$ linkages, providing structural support in plants.

Question 14

Which of the following statements about glycoproteins is CORRECT?

Accepted Answer

Glycoproteins are proteins with covalently attached oligosaccharide or polysaccharide chains.

Question 15

Which of the following is a correct description of the role of UDP-galactose in lactose biosynthesis?

Accepted Answer

UDP-galactose is a high-energy derivative that activates galactose for condensation with glucose.

Question 16

Which of the following is TRUE regarding the ABO blood group antigens?

Accepted Answer

They are O-linked glycoproteins found on the surface of red blood cells.

Question 17

Which of the following is a correct statement about the action of penicillin?

Accepted Answer

Penicillin inhibits the synthesis of peptidoglycan by blocking crosslinking reactions.

Question 18

Which of the following best describes the difference between conformational isomers and configurational isomers in carbohydrates?

Accepted Answer

Conformational isomers have the same stereochemical configuration but differ in three-dimensional conformation, while configurational isomers differ in the configuration at one or more chiral centers.

Question 19

Which of the following is a correct statement about amino sugars?

Accepted Answer

Amino sugars are carbohydrates in which at least one hydroxyl group has been replaced with an amine group.

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