Starch and its Components Quiz

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What is the purpose of adding sodium hydrogencarbonate to the test tube?

To neutralize the acidic conditions and allow the Benedict's Reagent to work (correct)

To change the color of the solution

To increase the pH of the solution

To test for the presence of a reducing sugar

What is the purpose of using pH paper in this experiment?

To check that the solution has been neutralized (correct)

To measure the pH of the solution

To test for the presence of a reducing sugar

To determine the type of sugar present

What color change is observed if a non-reducing sugar is present in the original sample?

The solution turns blue/black

The solution turns brick red (orange-brown) (correct)

The solution remains blue

The solution turns green

What chemical test is used to identify the presence of starch?

Iodine/potassium iodide Signup and view all the answers

What is the main difference between saturated and unsaturated lipids?

Saturated lipids are found in animal fats, while unsaturated lipids are found in plants Signup and view all the answers

What is the main structural component of a triglyceride molecule?

One molecule of glycerol and three fatty acids Signup and view all the answers

What is the primary difference between amylose and amylopectin?

Amylose is unbranched while amylopectin is branched Signup and view all the answers

Which property of starch makes it suitable for energy storage in plants?

Its compact structure that allows for storage of a large amount of energy in a small space Signup and view all the answers

What is the role of cellulose in plant cell walls?

Cellulose exerts inward pressure to keep the cell turgid and rigid Signup and view all the answers

What is the purpose of the 1,6 glycosidic bonds in amylopectin?

They allow amylopectin to be more easily hydrolyzed by enzymes Signup and view all the answers

Which type of polysaccharide is the main component of plant cell walls?

Cellulose Signup and view all the answers

What is the function of Benedict's reagent in biochemical tests?

To test for the presence of reducing sugars Signup and view all the answers

What type of glycosidic bond is formed between the glucose molecules in starch?

1,4 glycosidic bonds Signup and view all the answers

Which of the following is NOT a polysaccharide?

Sucrose Signup and view all the answers

What is the primary difference between amylose and amylopectin, the two components of starch?

Amylose is linear, while amylopectin is branched. Signup and view all the answers

Which of the following is the primary function of cellulose in plants?

Structural support Signup and view all the answers

How do the glycosidic bonds in cellulose differ from those in starch?

Cellulose has 1,4 beta-glycosidic bonds, while starch has 1,4 alpha-glycosidic bonds. Signup and view all the answers

What is the primary function of starch in plants?

Energy storage Signup and view all the answers