Question 1

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

Accepted Answer

Aldoses contain an aldehyde group at C1, while ketoses contain a ketone group at C2.

Question 2

Which of the following is a function of glycosaminoglycans in the human body?

Accepted Answer

They act as viscosity-increasing agents or lubricants in certain body fluids.

Question 3

Which of the following statements about enantiomers is correct?

Accepted Answer

Enantiomers are optical isomers that are nonsuperimposable mirror images.

Question 4

Which of the following best describes the process of glycosidic bond formation between two monosaccharides?

Accepted Answer

It is a condensation reaction that eliminates water to form a bond.

Question 5

Which of the following is true regarding the structure of amylopectin?

Accepted Answer

It is a branched polymer of glucose with $\alpha(1 \rightarrow 4)$ linkages and $\alpha(1 \rightarrow 6)$ branches.

Question 6

Which of the following is a correct description of an epimer?

Accepted Answer

Epimers are stereoisomers that differ in configuration at only one specific carbon atom.

Question 7

Which of the following best explains why UDP-galactose is required in lactose biosynthesis?

Accepted Answer

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

Question 8

Which of the following is a distinguishing feature of cellulose compared to starch?

Accepted Answer

Cellulose is a linear polymer of glucose with $\beta(1 \rightarrow 4)$ linkages.

Question 9

Which of the following statements about glycoproteins is correct?

Accepted Answer

Glycoproteins are proteins with covalently attached oligosaccharide or polysaccharide chains.

Question 10

Which of the following is a correct statement about the ABO blood group antigens?

Accepted Answer

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

Question 11

Which of the following is a correct description of a reducing sugar?

Accepted Answer

A sugar that contains a free anomeric carbon capable of acting as a reducing agent.

Question 12

Which of the following is a correct statement about the oxidation of glucose?

Accepted Answer

Oxidation at C1 yields an aldonic acid, which can form a lactone.

Question 13

Which of the following best describes the structure of chitin?

Accepted Answer

A homopolymer of N-acetyl-D-glucosamine with $\beta(1 \rightarrow 4)$ linkages.

Question 14

Which of the following is a correct statement about the formation of O-glycosidic bonds?

Accepted Answer

They are formed by the elimination of water between the anomeric carbon of a cyclic saccharide and the hydroxyl group of another compound.

Question 15

Which of the following is a correct description of a homopolysaccharide?

Accepted Answer

A polysaccharide composed of only one type of monosaccharide.

Question 16

Which of the following is a correct statement about the conformational isomers of pyranose rings?

Accepted Answer

They have the same stereochemical configuration but differ in their three-dimensional conformation (e.g., chair vs. boat).

Question 17

Which of the following best explains why cellulose cannot be digested by humans?

Accepted Answer

Humans lack the enzyme to hydrolyze $\beta(1 \rightarrow 4)$ glycosidic bonds present in cellulose.

Question 18

Which of the following is a correct statement about the role of peptidoglycans in bacteria?

Accepted Answer

They form cross-linked, multilayered polysaccharide-peptide complexes that provide structural support to bacterial cell walls.

Question 19

Which of the following is a correct description of the function of erythropoietin (EPO)?

Accepted Answer

EPO is a glycoprotein hormone that stimulates the production of red blood cells.

Carbohydrates: Structure, Classification, and Biological Roles

Study Guide - Practice Questions