Question 1

Which of the following best describes a glycosidic bond in carbohydrates?

Accepted Answer

A covalent bond formed between the anomeric carbon of one monosaccharide and a hydroxyl group of another.

Question 2

Cellulose is a polysaccharide composed of glucose units. What type of glycosidic linkage connects the glucose monomers in cellulose?

Accepted Answer

$$\beta-1$$,4-glycosidic bond

Question 3

Which of the following is a disaccharide formed by a glycosidic bond between glucose and fructose?

Accepted Answer

Sucrose

Question 4

A patient is unable to digest lactose due to a deficiency in a specific enzyme. Which bond is not being hydrolyzed?

Accepted Answer

$$\beta-1$$,4-glycosidic bond

Question 5

Which of the following best explains why cellulose is insoluble in water and indigestible by humans?

Accepted Answer

Cellulose contains $$\beta-1$$,4-glycosidic bonds, which human enzymes cannot hydrolyze.

Question 6

Which of the following reactions represents the hydrolysis of a glycosidic bond in maltose?

Accepted Answer

$$\mathrm{C$$_{12}$$H_{22}O$$_{11}} + \mathrm{H_2O} \rightarrow 2\ \mathrm{C_6H_{12}$$O_6$$}$

Question 7

Which statement correctly describes the difference between amylose and cellulose?

Accepted Answer

Amylose contains $$\alpha-1$$,4-glycosidic bonds, while cellulose contains $$\beta-1$$,4-glycosidic bonds.

Question 8

A chemist wants to synthesize a disaccharide from two glucose molecules. Which type of reaction is required?

Accepted Answer

Condensation (dehydration synthesis)

Question 9

Which of the following is a correct representation of the formation of a glycosidic bond between two monosaccharides?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + \mathrm{C_6H_{12}O_6$} \rightarrow \mathrm{C$$_{12}$$H_{22}O$$_{11}} + \mathrm{H_2O}$

Question 10

Which of the following best describes the role of glycosidic bonds in polysaccharides?

Accepted Answer

They connect monosaccharide units to form complex carbohydrates.

Question 11

A sample of starch is treated with amylase. Which type of bond will be cleaved during this reaction?

Accepted Answer

$$\alpha-1$$,4-glycosidic bond

Question 12

Which of the following is NOT a property of polysaccharides?

Accepted Answer

They are composed of nucleotides.

Question 13

Which of the following best explains why sucrose is a non-reducing sugar?

Accepted Answer

Both anomeric carbons are involved in the glycosidic bond, preventing oxidation.

Question 14

Which of the following statements about the structure of cellulose is correct?

Accepted Answer

Cellulose is a linear polymer with $$\beta-1$$,4-glycosidic bonds.

Question 15

Which of the following is a correct example of a polysaccharide and its biological function?

Accepted Answer

Starch: energy storage in plants

Question 16

A student mixes glucose and fructose in water and observes no reaction. What is required for these monosaccharides to form sucrose?

Accepted Answer

Removal of water through a condensation reaction

Question 17

Which of the following best describes the difference between reducing and non-reducing sugars?

Accepted Answer

Reducing sugars have a free anomeric carbon that can be oxidized; non-reducing sugars do not.

Question 18

Which of the following is the correct chemical formula for a disaccharide formed from two glucose molecules?

Accepted Answer

$$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$

Question 19

Which of the following best explains why polysaccharides are suitable for energy storage?

Accepted Answer

They contain many glycosidic bonds that can be hydrolyzed to release glucose.

Lecture #31 Carbohydrates: Structure, Glycosidic Bonds, and Polysaccharides

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