B3 Digestion and Food Testing

Which substance is broken down by the enzyme amylase?

• glucose

• lipids

• proteins

• starch

Where is bile produced?

• gall bladder

• liver

• pancreas

• stomach

Which substance emulsifies fats so they can be broken down by enzymes?

• bile

• glycerol

• saliva

• stomach acid

Which reagent is used to test foods for protein?

• Benedict’s solution

• biuret solution

• ethanol

• iodine

The enzyme lipase breaks down lipids into...?

• amino acids

• fatty acids and glycerol

• proteins

• glucose

Which statement about enzymes is not correct?

• they are proteins

• they are biological catalysts

• they break down large food molecules into smaller, soluble molecules

• they emulsify fats to increase the surface area for digestion

Which enzyme breaks down proteins into amino acids?

• amylase

• carbohydrase

• lipase

• protease

Why is bile alkaline?

• to emulsify fats

• to neutralise hydrochloric acid from the stomach

• to allow water to be absorbed into the blood

• to maintain the correct temperature for enzymes to work

In which of the following is amylase produced?

• large intestine

• liver

• salivary glands

• stomach

Which word describes an enzyme that no longer works because its active site has changed shape?

• denatured

• destroyed

• killed

• optimum