Answer five of the following:
(a) In carbohydrates, which two elements are in the ratio 2:1?
(b) Cellulose is a polysaccharide - Leaving Cert Biology - Question 1 - 2009
Question 1
Answer five of the following:
(a) In carbohydrates, which two elements are in the ratio 2:1?
(b) Cellulose is a polysaccharide. Explain the term polysaccharide. ... show full transcript
Worked Solution & Example Answer:Answer five of the following:
(a) In carbohydrates, which two elements are in the ratio 2:1?
(b) Cellulose is a polysaccharide - Leaving Cert Biology - Question 1 - 2009
Step 1
In carbohydrates, which two elements are in the ratio 2:1?
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Answer
In carbohydrates, the two elements that are in the ratio 2:1 are Hydrogen and Oxygen.
Step 2
Explain the term polysaccharide.
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Answer
A polysaccharide is a type of carbohydrate that is made up of many sugar units, which are typically simple sugars (monosaccharides) linked together by glycosidic bonds. These molecules can be linear or branched and serve various functions in biological systems, including energy storage and providing structural support.
Step 3
Name a polysaccharide other than cellulose.
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Answer
One example of a polysaccharide other than cellulose is starch. Starch serves as an energy reserve in plants.
Step 4
Where precisely in a plant cell would you expect to find cellulose?
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Answer
Cellulose is found in the cell wall of plant cells. It provides structural integrity and rigidity to the cell.
Step 5
Name a test or give the chemicals used to demonstrate the presence of a reducing sugar.
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Answer
To demonstrate the presence of a reducing sugar, the Benedict's test can be used. The test involves heating the sample with Benedict's reagent, which changes color in the presence of reducing sugars.
Step 6
In relation to the test referred to in (e) which of the following is correct?
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Answer
The correct statement is: Heat but do not boil. This is necessary to avoid degrading the reducing sugars.
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