Biological Molecules

Question 1

What are the 4 key chemical elements present?

Answer 1

Carbon
Oxygen
Hydrogen
Nitrogen

Question 2

What are the 4 key elements found in?

Answer 2

Carbohydrates
Proteins
Lipids

Question 3

What are the different forms of Carbohydrates?

Answer 3

Monosaccharides
Disaccharides
Polysaccharides

Question 4

What are Monosaccharides?

Answer 4

One unit of sugar for example glucose or fructose

Question 5

What are Disaccharides?

Answer 5

Two Monosaccharides bonded together for example maltose and sucrose

Question 6

What are Polysaccharides?

Answer 6

Lots of Monosaccharides bonded together for example starch and glycogen

Question 7

What are Proteins?

Answer 7

They contain carbon, hydrogen, oxygen and nitrogen. The are made up of smaller units called amino acids

Question 8

What are Lipids?

Answer 8

They contain carbon, hydrogen and oxygen and they’re made up of 2 smaller units called glycerol and fatty acids.

Question 9

What is the test for starch?

Answer 9

1. Add a food sample to a test tube.
2. Add a few drops of iodine.
3. If starch is present then it’ll turn from orange to blue-black.

Question 10

What is the test for glucose?

Answer 10

1. Add a food sample to a test tube.
2. Heat the test tube using a water bath for around 5 minutes.
3. If glucose is present then it’ll turn from blue to orange/brick red

Question 11

What is the test for proteins?

Answer 11

1. Add a food sample to a test tube.
2. Add a few drops of Biuret solution.
3. If proteins are present then it’ll turn from blue to purple.