Digestive Enzymes and Absorption

Which molecules speed up digestion?

• Teeth

• Hormones

• Proteins

• Enzymes

All enzymes in your body will break down food.

• True

• False

Answer explanation

It's false! Not all enzymes break their substrates apart, some stick them together. Many enzymes speed up reactions outside of your digestive system.

Which part of an enzyme fits into its substrate or substrates?

• Lock and key

• Active site

• Protein

Answer explanation

The active site fits together with the substrate or substrates.

What is the term given to an enzyme which has changed shape and will no longer work?

• Broken

• Dead

• Non-functional

• Denatured

Answer explanation

The term given to an enzyme which has changed shape and will no longer work is denatured.

Which condition does not denature enzymes?

• High pH

• Low pH

• High temperature

• Low Temperature

Answer explanation

Low temperatures do not denature enzymes unlike high temperatures and high and low pH which do.

What are the products of the breakdown of lipids?

• 
  Fatty acids and glycerol

• Sugars

• Amino acids

Answer explanation

Lipids are broken down into fatty acids and glycerol.

Bile is not an enzyme because it doesn't digest fat.

• True

• False

Answer explanation

It's true! Bile is not an enzyme because it breaks down fat into smaller droplets but doesn't digest it into nutrients.

Which part of the digestive system releases all three types of enzyme?

• Stomach

• Large intestine

• Small intestine

• Mouth

Answer explanation

The small intestine releases all three types of digestive enzyme. The mouth only releases one type to break down carbohydrates. The stomach only releases one type to break down proteins. The large intestine doesn’t release enzymes.

Which enzymes are produced only in the pancreas and small intestine?

• Protease

• Carbonhydrase

• Lipase

Answer explanation

Lipase enzymes are only produced in the pancreas and small intestine. Carbohydrase enzymes are also produced in the mouth. Protease enzymes are also produced in the stomach.

(a)   digestion occurs when enzymes digest food into nutrients.

• Chemical
• Mechanical