4 There are many different types of enzymes used in the digestion of food. Explain why so many enzymes are needed.
5. a. Enzymes are affected by temperature. Each different type of enzyme has a certain temperature that it works best at. This is because temperature change affects the shape of an enzyme, and this affects how well it can fit onto a molecule. Which model would be better to represent this effect? Explain your reasoning.
b. Draw four squares linked end-to-end with straight lines. This represents a food molecule. Add to your drawing, and draw other food molecules to explain how digestive enzymes work.