Carbohydrates Flashcards
(5 cards)
1
Q
Describe a biochemical test to show that raffinose is contains a non reducing sugar.
A
- heat with acid and neutralise with sodium hydrogen carbonate
- Heat with benedicts solution
- Red precipitate will form
2
Q
What method can be used to measure the quantity of a reducing sugar other than colorimetry?
A
- filter and dry the precipitate
- find the mass
3
Q
Why would colorimetry improve the repeatability of the students results?
A
- it is quantitative
- standardises method
4
Q
What is the test for starch?
A
- iodine/ potassium iodide
- orange to blue black
5
Q
Explain how cellulose molecules are adapted for their function in plant cells.
A
- long and straight chains
- linked by hydrogen bonds to form fibrils
- provide strength
