Question

1. the picture below shows the lock - and - key model of enzyme function.

what is taking place in the second step of this process?
a. the catalyzed reaction is releasing a product.
b. the active sites are restructuring the enzyme.
c. the substrates are beginning to alter the enzyme.
d. the enzyme is causing bonds to break within the substrate.

Explanation:

In the lock - and - key model of enzyme function, in step 2 the enzyme - substrate complex is formed. The enzyme's active site binds to the substrate, and the enzyme starts to act on the substrate. This often involves the enzyme causing bonds to break within the substrate to initiate the reaction. Option A is incorrect as product release occurs in step 3. Options B and C are incorrect as the enzyme's structure is not being restructured or altered by the substrate in this step; rather, the enzyme acts on the substrate.

Answer:

D. The enzyme is causing bonds to break within the substrate.