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18 Questions

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Cellulose Structure and Properties

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Questions and Answers

What type of linkage allows cellulose to form long straight chains?

β(1→4) linkage (correct)

γ(1→3) linkage

β(1→6) linkage

α(1→4) linkage

Why is cellulose considered water-insoluble?

Because of extensive intra-chain hydrogen bonding

Presence of β(1→4) glycosidic linkage (correct)

Lack of hydrogen bonding within the cellulose chains

Due to the presence of α(1→4) glycosidic linkage

Which polysaccharide is often strengthened by lignin in cell walls?

Hemicellulose

Pectin

Amylose

Cellulose (correct)

How does the structure of cellulose differ from that of amylose?

Amylose has branched chains, while cellulose forms long straight chains Signup and view all the answers

What is the role of hemicellulose in cell walls?

Acting as a cementing material between cellulose fibers Signup and view all the answers

How is the structure of cellulose suited to its function?

Cellulose forms long straight chains due to β(1→4) linkages, providing rigidity and strength Signup and view all the answers

What distinguishes glycogen from amylopectin in terms of branch points?

Glycogen has branch points every 8 to 12 glucose residues. Signup and view all the answers

What distinguishes glycogen from starch in terms of compactness?

Glycogen is more compact than starch. Signup and view all the answers

Why does cellulose contain only β(1→4) glycosidic linkages?

To resist enzymatic degradation. Signup and view all the answers

What is the primary function of chitin in organisms?

Structural support in cell walls. Signup and view all the answers

Which component is NOT typically found in plant cell walls aside from cellulose?

Glycogen. Signup and view all the answers

What distinguishes hemicellulose and pectins from cellulose in plant cell walls?

They are more soluble in water. Signup and view all the answers

What is the major component of the hard exoskeletons of most arthropods and the cell walls of fungi?

Chitin Signup and view all the answers

How is chitin different from cellulose at the chemical level?

Acetylated amino group at C2 Signup and view all the answers

Which type of chitin exists as all parallel chains in nature?

α-Chitin Signup and view all the answers

What function does chitin serve when used to make surgical thread?

Decomposes after healing Signup and view all the answers

Cellulose primarily serves which function in nature?

Provides structural support in plant cell walls Signup and view all the answers

What type of linkage is found in cellulose between glucose monomers?

1–4 linkage of β glucose monomers Signup and view all the answers