Tests For Biological Molecules

Question 1

Test for starch

Answer 1

Add iodine to sample, turn to blue/black.

Question 2

Test for reducing sugars

Answer 2

Heat with Benedict colour change form blue to green to yellow to orange.

Question 3

Test for on reducing sugar

Answer 3

You have to hydrolyse bond.
1)take test for reducing.
2)boil with hydrochloric acid
3)cool, and add sodium hydrogencarbonate, to ensure it’s neutralised.
4)test for reducing.

Question 4

Tests for lipids

Answer 4

Take sample, mix with ethanol and H2O. Filter it , and will become cloudy while emulsion,

Question 5

Test for biruets

Answer 5

Add iodine turns blue/black if present.

Question 6

Colorimeter

Answer 6

Shining light through sample.
Place in cuvette, and put in colorimeter.
Plot table. And calibration curve..

Question 7

Use of biosensors

Answer 7

Take biological substances, and convert to electrical.

Question 8

Chromotography

Answer 8

1)draw line with pencil and put tiny drop on line.
2)spot solution on pencil dot, wait to dry. Then lower to solvent.
3)cover beaker with watch glass.