Five test-tubes containing cooked egg white are set up as shown. Cooked egg white contains a protein. Protease solutions of different pH are added to each tube. Which diagram shows the results of this experiment for a protease from the stomach? [Diagrams A, B, C, D]

Amylase solution is tested with Benedict's solution, biuret solution and iodine solution. Which colours are obtained?

Which property of enzymes is explained by the lock and key hypothesis?

In an enzyme's action, where is the active site and where are the lock and the key?

Define the term homeostasis.

Compare the processes of mitosis and meiosis.

Explain how humans are dependent upon the process of photosynthesis.