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CHAPTER 2 REDUX

QuestionAnswer
Starch is a polysaccharide consisting of long chains of glucose.
Iodine is a yellowish-brown colored liquid that turns blue or black when it contacts starch
You need to use clean equipment when testing chemicals to prevent contamination
Starch is a storage form of carbohydrates in plants. As a food source, starch is vital to survival. Testing for starch content helps you more clearly understand food choices.
Glucose A small, six-carbon sugar molecule found in starch and glycogen. A common monosaccharide.
Monosaccharide One individual molecule of sugar; the building blocks of carbohydrates.
Diasaccharide A carbohydrate made up of two sugar molecules linked together.
Maltose A disaccharide consisting of two glucose molecules bound together.
Simple Sugar Monosaccharides and disaccharides.
Oligosaccharide A carbohydrate made up of more than two sugar molecules linked together.
Polysaccharide A carbohydrate made up of hundreds to thousands of sugar molecules linked together.
Starch A plant-based polysaccharide.
Glycogen An animal-based polysaccharide.
Iodine A solution that turns from brown to purple in the presence of starch.
Positive Control Any procedure that is known to produce the desired result. A positive test result means what you are looking for is present.
Negative Control Any procedure that is known to NOT produce the desired result. A negative test result means what you are looking for is NOT present.
A ----- result for starch occurs when iodine turns color. positive test
Medium blue is a small amount of starch
dark blue indicates a medium amount of starch
blue-black indicates a large amount of starch
A negative test result for starch occurs when ----- stays yellow. iodine
Since ----- tests for the presence of starch, you can verify that a positive result turns purple by using a solution of starch iodine
Starch will be Blue-Black (YES Starch) (High Concentrated)
Glucose will be Yellow (NO Starch) (Not concentrated)
Water will be Yellow (NO Starch) (Not concentrated)
Potato will be Blue-Black (YES Starch) (Not concentrated)
Onion will be Yellow (NO Starch) (Not concentrated)
Glucose and starch are both carbohydrates. Why does glucose produce a negative result when testing using iodine? Iodine only tests for polysaccharides, and glucose is a monosaccharide
Created by: Russells3709
 

 



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