IGCSE Biology: Digestive System.

How confident are you that you know everything you have been taught about this topic?
(Completely confident = 1, I can't remember anything = 5)

• 1
• 2
• 3
• 4
• 5

Which enzyme catalyses proteins to amino acids?

• Amylase
• Lipase
• Protease
• Don't know

Which enzyme catalyses lipids to fatty acids and glycerol?

• Amylase
• Lipase
• Protease
• Don't know

What is the substrate that amylase catalyses?

• Starch
• Protein
• Lipids
• Don't know

Pancreatic amylase and lipase are released into the...

• Pancreas
• Liver
• Duodenum
• Don't know

The protease enzymes that work in the stomach work best at pH...

• 1
• 7
• 11
• Don't know

What word describes enzymes that connect work because their active site has been permanently changed?

• Destroyed
• Denatured
• Emaciated
• Don't know

Tick all that apply. The villi are designed to...

• Increase the surface area for absorption of the products of digestion
• To maintain a diffusion gradient between the inside of the small intestine and the blood
• Absorb digested lipids into the lymphatic system
• To make bile to emulsify lipids
• Don't know

In which section of the digestive system are the villi found?

• Ileum
• Colon
• Duodenum
• Don't know

Dialysis tubing is selectively permeable. What does this mean?

• It will allow large particles/molecules to pass through it, but not small ones.
• It will choose which particles/molecules it wants to pass through it.
• It will allow only small particles/molecules to pass through it, but not large ones.
• Don't know