Exercise 2: Detection of Starch Data Table 2. Starch Tests with IKI Indicator. T
ID: 920487 • Letter: E
Question
Exercise 2: Detection of Starch
Data Table 2. Starch Tests with IKI Indicator.
Test tube
number
Substance
Hypothesis
Final color
Test results for starch
1
Distilled water
2
Glucose solution
3
Starch solution
4
Table sugar
5
Splenda®
6
Sweet’N Low®
7
Milk
8
Juice
9
Potato
Questions
Which sugar substitute tested positive for presence of starch? This sugar substitute contains a starch derived from corn or potatoes. List the ingredient that is the starch.
List three examples of polysaccharides in living organisms. Describe the structural orientations of each.
When a human consumes starch, the polysaccharides are broken down into simple sugars, which are converted to polysaccharides for storage in the cells. However, simple sugars are used by the cell to perform work. Describe why it is necessary to change the form of the carbohydrate in the body.
Test tube
number
Substance
Hypothesis
Final color
Test results for starch
1
Distilled water
2
Glucose solution
3
Starch solution
4
Table sugar
5
Splenda®
6
Sweet’N Low®
7
Milk
8
Juice
9
Potato
Explanation / Answer
Which sugar substitute tested positive for presence of starch? This sugar substitute contains a starch derived from corn or potatoes. List the ingredient that is the starch.
Splenda because it contains maltodextrin which is a form partially hydrolized of startch
List three examples of polysaccharides in living organisms. Describe the structural orientations of each.
Chitin :is a long-chain polymer of a N-acetylglucosamine. The units that repeat to form long chains in -1,4 linkage.
Glycogen; is a glucose polymer of (14) glycosidic bonds linked, with (16)-linked branches
cellulose: is a polysaccharide consisting of a linear chain of several hundred to many thousands of (14) linked D-glucose units
When a human consumes starch, the polysaccharides are broken down into simple sugars, which are converted to polysaccharides for storage in the cells. However, simple sugars are used by the cell to perform work. Describe why it is necessary to change the form of the carbohydrate in the body.
It is necessary to change it because the rate which the glucose is released from glycogen is faster compared to another polysaccharide. This speed is needed to allow human to do works that demand a high consume of energy in short time.
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