Question 1

Which of the following best describes the repeating sugar unit in chitin?

Accepted Answer

N-acetylglucosamine

Question 2

What type of glycosidic linkage is found in chitin?

Accepted Answer

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

Question 3

Which of the following organisms is most likely to contain chitin as a structural component?

Accepted Answer

Animals such as crustaceans and insects

Question 4

Chitin is classified as which of the following?

Accepted Answer

An unbranched homopolysaccharide of N-acetylglucosamine

Question 5

Which of the following statements best explains the main structural difference between cellulose and chitin?

Accepted Answer

The C-2 carbon in the chitin monomer contains an N-acetyl group instead of an OH group.

Question 6

Which of the following is NOT a function of chitin?

Accepted Answer

Energy storage in animals

Question 7

Which of the following best describes the chemical structure of chitin?

Accepted Answer

A polymer of N-acetylglucosamine linked by $$\beta-1$$,4 glycosidic bonds

Question 8

Which of the following statements is TRUE regarding the branching of chitin?

Accepted Answer

Chitin is unbranched

Question 9

A scientist is comparing the structure of chitin and cellulose. Which chemical group is present in chitin but absent in cellulose?

Accepted Answer

N-acetyl group at C-2

Question 10

Which of the following best explains why chitin provides rigidity and strength to arthropod exoskeletons?

Accepted Answer

The linear arrangement of N-acetylglucosamine units with extensive hydrogen bonding

Question 11

Which of the following statements about the glycosidic linkage in chitin is correct?

Accepted Answer

It is a $$\beta-1$$,4 glycosidic linkage

Question 12

Which of the following best describes the monomeric unit of chitin?

Accepted Answer

N-acetylglucosamine

Question 13

Which of the following is a key difference between the monomers of chitin and cellulose?

Accepted Answer

Chitin contains N-acetylglucosamine, while cellulose contains glucose.

Chitin: Structure, Properties, and Comparison with Cellulose

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