biochemical tests

Question 1

What is a reducing and non reducing sugar
Examples

Answer 1

reducing sugars - They can donate electrons and becomes oxidised and become the reducing agent
examples : glucose, fructose and galactose

non- reducing sugars - Cannot donate electrons
example: sucrose

Question 2

How do you test for starch

Answer 2

Add a few drops of iodine in potassium iodide solution to the sample (orange/brown)
If starch is present iodine ions will react with the centre of the starch creating a blue/black colour.

Question 3

what is a serial dilution and how to you do it

Answer 3

Taking a series of solutions of a stock solution
- concentration decreases by the same every time
- can be doubling dilutions where the concentration is halved between each test tube.