Question 1

Which of the following statements best explains why sucrose does not give a positive test with Benedict’s reagent?

Accepted Answer

Sucrose cannot form an open-chain structure with a free aldehyde group.

Question 2

Which of the following is the correct product when D-glucose is reduced?

Accepted Answer

D-sorbitol

Question 3

A patient with lactose intolerance cannot digest lactose because they lack the enzyme to break which type of glycosidic bond?

Accepted Answer

$$\beta(1 \rightarrow 4)$$ glycosidic bond

Question 4

Which of the following polysaccharides is the main storage form of glucose in animals?

Accepted Answer

Glycogen

Question 5

What is the result of the oxidation of the aldehyde group in D-glucose?

Accepted Answer

Formation of D-gluconic acid

Question 6

Which of the following best describes the structure of amylopectin?

Accepted Answer

Branched chains of glucose with $$\alpha(1 \rightarrow 4)$$ and $$\alpha(1 \rightarrow 6)$$ glycosidic bonds

Question 7

Which of the following is a reducing sugar?

Accepted Answer

Lactose

Question 8

Which of the following statements about cellulose is correct?

Accepted Answer

Cellulose is composed of glucose units connected by $$\beta(1 \rightarrow 4)$$ glycosidic bonds.

Question 9

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

Accepted Answer

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

Question 10

Which of the following reactions occurs when Benedict’s solution is added to a solution containing D-glucose?

Accepted Answer

D-glucose is oxidized to D-gluconic acid.

Question 11

Which of the following is a correct description of the glycosidic bond in maltose?

Accepted Answer

$$\alpha(1 \rightarrow 4)$$ bond between two glucose units

Question 12

Which of the following is a sugar alcohol produced by the reduction of D-mannose?

Accepted Answer

D-mannitol

Question 13

Which of the following best describes the difference between amylose and amylopectin?

Accepted Answer

Amylose is unbranched, while amylopectin is branched.

Question 14

Which of the following is a correct statement about the digestion of starch in the human body?

Accepted Answer

Starch is digested by amylase and maltase to produce glucose.

Question 15

Which of the following best describes the branching in glycogen compared to amylopectin?

Accepted Answer

Glycogen is more highly branched than amylopectin.

Question 16

Which of the following is a correct description of the monosaccharide units in sucrose?

Accepted Answer

Glucose and fructose

Question 17

Which of the following best describes the reaction that forms a disaccharide from two monosaccharides?

Accepted Answer

Dehydration (condensation) reaction

Question 18

Which of the following is a correct statement about the solubility of cellulose in water?

Accepted Answer

Cellulose is insoluble in water because it cannot form hydrogen bonds with water.

Question 19

Which of the following best explains why sugar alcohols are used as sweeteners in sugar-free products?

Accepted Answer

They are not metabolized by oral bacteria and do not promote tooth decay.

Carbohydrates: Chemical Properties, Disaccharides, and Polysaccharides

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