Question

summary

• enzymes work by lowering the activation energy needed to start biochemical reactions.
• the activities of enzymes depend on the temperature and the ph of the surroundings.

review

1. how do enzymes speed up biochemical reactions?
2. where is the active site located? explain the role of the active site?
3. complete this sentence: the activities of enzymes depends on the __________ and the __________ of the surroundings.
4. distinguish between the conditions needed for the proper functioning of pepsin and trypsin.

1.2 references

Explanation:

1. Enzymes speed up biochemical reactions by lowering the activation energy required to start them.
2. The active - site is on the enzyme. It is where the substrate binds and the chemical reaction occurs.
3. The activities of enzymes depend on the temperature and the pH of the surroundings.
4. Pepsin works best in an acidic environment (pH 1 - 3) and at body - like temperatures (30 - 40°C). Trypsin works best in a more alkaline environment (around pH 7 - 8) and also at body - like temperatures.

Answer:

1. By lowering the activation energy.
2. On the enzyme; it is the binding site for the substrate and the site of the chemical reaction.
3. temperature; pH
4. Pepsin: acidic (pH 1 - 3), 30 - 40°C; Trypsin: alkaline (pH 7 - 8), 30 - 40°C