Question 1

Which of the following statements best describes a dehydration synthesis reaction in carbohydrate chemistry?

Accepted Answer

It is a reaction where two monosaccharides combine to form a disaccharide, releasing water.

Question 2

Which of the following is a correct classification for a carbohydrate with the formula $$\mathrm{C_6H_{12}O_6$}$$ that contains an aldehyde group?

Accepted Answer

It is an aldohexose.

Question 3

Which of the following statements about polysaccharides is TRUE?

Accepted Answer

Polysaccharides are polymers of monosaccharides.

Question 4

Which of the following best describes a chiral carbon atom?

Accepted Answer

A carbon atom bonded to four different atoms or groups.

Question 5

Which of the following is a reducing sugar?

Accepted Answer

Lactose

Question 6

When maltose undergoes hydrolysis, which monosaccharides are produced?

Accepted Answer

Two molecules of glucose

Question 7

Which of the following polysaccharides is found in animals and serves as a storage form of glucose?

Accepted Answer

Glycogen

Question 8

Which of the following best describes the difference between an α(1→4)-glycosidic bond and a β(1→4)-glycosidic bond?

Accepted Answer

The α(1→4) bond connects monosaccharides with the OH group below the ring, while the β(1→4) bond connects them with the OH group above the ring.

Question 9

Which of the following is a function of carbohydrates in living organisms?

Accepted Answer

They provide structural support and energy storage.

Question 10

Which of the following statements about cellulose is correct?

Accepted Answer

Cellulose is a polymer of D-glucose with β(1→4)-glycosidic bonds.

Question 11

A student is given a Haworth projection of a monosaccharide and asked to classify it as an α- or β-isomer. Which feature should the student examine?

Accepted Answer

The position of the anomeric OH group relative to the CH$$_2OH $$group.

Question 12

Which of the following best describes the hydrolysis of sucrose?

Accepted Answer

Sucrose is split into glucose and fructose.

Question 13

Which of the following is TRUE about the D- and L- isomers of monosaccharides?

Accepted Answer

D- and L- isomers are mirror images of each other.

Question 14

Which of the following is a disaccharide composed of glucose and galactose?

Accepted Answer

Lactose

Question 15

Which of the following best describes amylopectin?

Accepted Answer

A branched polymer of D-glucose found in plants.

Question 16

A carbohydrate is classified as a ketose if:

Accepted Answer

It contains a ketone group as its carbonyl functional group.

Question 17

Which of the following statements about glycosidic bonds is correct?

Accepted Answer

Glycosidic bonds connect monosaccharides in carbohydrates.

Question 18

Which of the following best explains why humans cannot digest cellulose?

Accepted Answer

Humans lack the enzyme to break β(1→4)-glycosidic bonds.

Question 19

Which of the following is a correct sequence of events in the digestion of a starch molecule?

Accepted Answer

Hydrolysis of glycosidic bonds produces monosaccharides.

Question 20

A patient with lactose intolerance lacks the enzyme to hydrolyze which glycosidic bond?

Accepted Answer

β(1→4)-glycosidic bond

Chapter 13: Carbohydrates – Structure, Classification, and Reactions

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