18 Questions
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
What is the purpose of using pH paper in this experiment?
To check that the solution has been neutralized
What color change is observed if a non-reducing sugar is present in the original sample?
The solution turns brick red (orange-brown)
What chemical test is used to identify the presence of starch?
Iodine/potassium iodide
What is the main difference between saturated and unsaturated lipids?
Saturated lipids are found in animal fats, while unsaturated lipids are found in plants
What is the main structural component of a triglyceride molecule?
One molecule of glycerol and three fatty acids
What is the primary difference between amylose and amylopectin?
Amylose is unbranched while amylopectin is branched
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
What is the role of cellulose in plant cell walls?
Cellulose exerts inward pressure to keep the cell turgid and rigid
What is the purpose of the 1,6 glycosidic bonds in amylopectin?
They allow amylopectin to be more easily hydrolyzed by enzymes
Which type of polysaccharide is the main component of plant cell walls?
Cellulose
What is the function of Benedict's reagent in biochemical tests?
To test for the presence of reducing sugars
What type of glycosidic bond is formed between the glucose molecules in starch?
1,4 glycosidic bonds
Which of the following is NOT a polysaccharide?
Sucrose
What is the primary difference between amylose and amylopectin, the two components of starch?
Amylose is linear, while amylopectin is branched.
Which of the following is the primary function of cellulose in plants?
Structural support
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.
What is the primary function of starch in plants?
Energy storage
Test your knowledge on the composition of starch found in plants, including the polysaccharides amylose and amylopectin. Learn about the structure and energy storage capabilities of these two components.
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