Unit 4 - Biological Molecules Flashcards
1
Q
Elements in Carbohydrates
A
- Carbon
- Hydrogen
- Oxygen
2
Q
Elements in Fats
A
- Carbon
- Hydrogen
- Oxygen
3
Q
Elements in Proteins
A
- Carbon
- Hydrogen
- Oxygen
- Nitrogen
- Sometimes Sulphur
4
Q
Test for Starch
A
Iodine will turn from orange to blue-black.
5
Q
Test for Reducing Sugars (glucose)
A
Benedicts solution + heat will turn from blue to green/yellow/orange
6
Q
Test for Protein
A
Biurets test will turn from blue to lilac/purple
7
Q
Test for fats and oils
A
Emulsion test. Add ethanol to test tube with sample, shake vigourously. The sample will turn cloudy milky if positive
8
Q
Test for Vitamin C
A
DCPIP decolourises(will become clear from blue) if positive
9
Q
Solvent
A
A liquid that dissolves substances. Water is an important solvent in organisms for digestion, excretion and transport.
