Active site in induced fit theory is static/dynamic.

Explanation

To answer the question regarding whether the active site in the induced fit theory is static or dynamic, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Induced Fit Theory**:
- The induced fit theory, proposed by Daniel E. Koshland in 1958, describes how enzymes interact with substrates. Unlike the lock and key model, which suggests that the active site of an enzyme is a perfect fit for the substrate, the induced fit theory suggests that the active site is flexible and can change shape to accommodate the substrate.

2. **Definition of Static and Dynamic**:
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