Question 1

Which of the following statements correctly describes the formation of a glycosidic bond in disaccharides?

Accepted Answer

A glycosidic bond forms when the hydroxyl group on the anomeric carbon of one monosaccharide reacts with a hydroxyl group on another monosaccharide, releasing water in a condensation reaction.

Question 2

Which glycosidic bond is present in maltose?

Accepted Answer

$$\alpha(1 \rightarrow 4)$$

Question 3

Which of the following disaccharides is NOT a reducing sugar?

Accepted Answer

Sucrose

Question 4

What is the product when two D-glucose molecules are joined by an $$\alpha(1 \rightarrow 4)$$ glycosidic bond?

Accepted Answer

Maltose

Question 5

Which statement best explains why sucrose is not a reducing sugar?

Accepted Answer

Because both anomeric carbons are involved in the glycosidic bond, leaving no free anomeric carbon.

Question 6

Which glycosidic bond is found in lactose?

Accepted Answer

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

Question 7

A patient with lactose intolerance lacks which enzyme, and what is the consequence in the digestive tract?

Accepted Answer

Lactase; undigested lactose is broken down by intestinal bacteria, causing gas and cramping.

Question 8

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

Accepted Answer

Amylose is a straight chain of $$\alpha(1 \rightarrow 4)$$ glucose units, while amylopectin is branched with $$\alpha(1 \rightarrow 6)$$ bonds.

Question 9

Which polysaccharide is the main storage form of glucose in animals, and how does its structure differ from amylopectin?

Accepted Answer

Glycogen; it has more frequent $$\alpha(1 \rightarrow 6)$$ branching than amylopectin.

Question 10

Cellulose is an important dietary fiber because:

Accepted Answer

Cellulose is composed of $$\beta(1 \rightarrow 4)$$ glucose units, which humans cannot digest, but it aids digestive movement.

Question 11

Which of the following is TRUE about the structure of chitin?

Accepted Answer

Chitin is made of N-acetylglucosamine units joined by $$\beta(1 \rightarrow 4)$$ glycosidic bonds.

Question 12

Which of the following best describes the role of the anomeric carbon in monosaccharide chemistry?

Accepted Answer

It is the carbon that forms the ring structure by reacting with a hydroxyl group.

Question 13

Which of the following is the correct convention for naming glycosidic bonds?

Accepted Answer

Specify the type (alpha or beta) and the carbons joined by the bond.

Question 14

Which of the following is a correct example of a condensation reaction in carbohydrate chemistry?

Accepted Answer

Formation of maltose from two glucose molecules, releasing $$H_2O$$

Question 15

Which of the following is the correct glycosidic bond in cellobiose?

Accepted Answer

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

Question 16

Which of the following is TRUE regarding the structure of sucrose?

Accepted Answer

Sucrose contains an $$\alpha,\beta(1 \rightarrow 2)$$ glycosidic bond between glucose and fructose.

Question 17

Which of the following is a correct real-world application of glycosidic bond hydrolysis?

Accepted Answer

Digestion of starch in the human body to produce glucose for energy.

Question 18

Which of the following correctly matches a disaccharide with its monosaccharide components and glycosidic bond?

Accepted Answer

Maltose: glucose + glucose, $$\alpha(1 \rightarrow 4)$$

Chapter 6: Carbohydrates – Structure, Glycosidic Bonds, and Disaccharides

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