Question 1

Which glycosidic linkage is responsible for the branching in amylopectin?

Accepted Answer

$$\alpha-1$$,6$

Question 2

What is the primary biological function of starch in plants?

Accepted Answer

Energy storage

Question 3

Which polysaccharide is an unbranched homopolymer of $$\alpha-D-$$glucose?

Accepted Answer

Amylose

Question 4

Cellulose differs from starch in that cellulose contains which type of glycosidic linkage?

Accepted Answer

$$\beta-1$$,4$

Question 5

Which of the following is a branched polysaccharide found in plants?

Accepted Answer

Amylopectin

Question 6

Amylose and amylopectin are both composed of which repeating sugar unit?

Accepted Answer

Glucose

Question 7

Which statement best describes the structure of amylopectin?

Accepted Answer

It is a branched polymer with $$\alpha-1$$,4$$ and $$\alpha$$-1,6$$ linkages.

Question 8

Which of the following polysaccharides is NOT found in plants?

Accepted Answer

Glycogen

Question 9

A scientist isolates a polysaccharide from a plant and finds it is unbranched and forms a helical structure. What is the most likely identity of this polysaccharide?

Accepted Answer

Amylose

Question 10

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

Accepted Answer

It contains $$\beta-1$$,4$ glycosidic linkages and forms strong hydrogen bonds.

Question 11

Which of the following is a structural polysaccharide in plant cells?

Accepted Answer

Cellulose

Question 12

Amylose fibers resemble which secondary structure in proteins?

Accepted Answer

$$\alpha-$$helix

Question 13

Which of the following statements about starch is correct?

Accepted Answer

It is composed of $$\alpha-D-$$glucose units.

Question 14

Which glycosidic linkage is found in both amylose and amylopectin?

Accepted Answer

$$\alpha-1$$,4$

Question 15

A patient is diagnosed with a deficiency in enzymes that break $$\alpha-1$$,6$ glycosidic bonds. Which polysaccharide would be most affected in their digestion?

Accepted Answer

Amylopectin

Question 16

Which of the following is TRUE about the branching frequency in amylopectin?

Accepted Answer

Branches occur every 24-30 residues.

Question 17

Which of the following is a correct comparison between amylose and cellulose?

Accepted Answer

Amylose has $$\alpha-1$$,4$$ linkages, cellulose has $$\beta$$-1,4$$ linkages.

Question 18

Which of the following polysaccharides is most similar in structure to glycogen?

Accepted Answer

Amylopectin

Question 19

Which of the following is NOT a function of starch in plants?

Accepted Answer

Structural support

Question 20

Which of the following statements about amylose is FALSE?

Accepted Answer

It contains $$\alpha-1$$,6$ glycosidic linkages.

Starch: Structure, Types, and Biological Function

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