Edexcel IGCSE (9-1) Biological Molecules and Enzymes

What type of molecule contains glycerol?

• carbohydrate

• fat

• none of these

• protein

What type of molecule contains amino acids?

• simple carbohydrate

• fat

• complex carbohydrate

• protein

What type of molecule is an enzyme?

• simple carbohydrate

• fat

• complex carbohydrate

• protein

The diagram shows the structure of something called a triglyceride. A triglyceride is a

• fat

• protein

• carbohydrate

• sugar

If the yellow and blue circles in this diagram represent amino acids, then this whole structure represents...

• a protein

• a fat

• a reducing sugar

• a carbohydrate

• None of these

Which of the following tests for starch?

• Iodine solution

• Benedict's

• Biuret

Which of the following tests for protein?

• Iodine solution

• Benedict's

• Biuret

Which of the following tests for glucose?

• Iodine solution

• Benedict's

• Biuret

Which test requires heat?

• Benedict's

• Biuret

• Iodine solution

What is the colour would you see if you add iodine solution to a food that contains protein?

• Brick Red

• Yellow

• Blue-Black

• Purple