Question

question 3
the enzyme that helps to break down protein is called
lipase.
lactase.
protease.
protein enzyme.

Explanation:

Enzymes are biological catalysts. Lipase breaks down lipids (fats), lactase breaks down lactose (a sugar), protease breaks down proteins, and "protein enzyme" is not a standard specific name for an enzyme that breaks down protein in the context of common enzyme - naming conventions.

Answer:

protease