The induced-fit model replaced which earlier picture of enzyme and substrate binding?

1. For many years scientists thought enzyme and substrate binding took place in a simple lock-and-key fashion. 2. That model asserted the enzyme and substrate fit together perfectly in one instantaneous step. 3. Current research supports a more refined view called induced fit, which expands upon the lock-and-key model. 4. The fluid mosaic model describes membrane structure and has nothing to do with enzyme binding. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 6 "Metabolism", section 6.5 Enzymes_