9. What is the activation
center of an enzyme? Is it the
key or the lock of the lock and
key model?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
The center is a region of the
enzyme produced by its
conformation to which the substrate
binds. In the and model the
activation center is the lock and the
substrate isthe key.