1. Temperature: Enzymes have an optimal temperature at which they function best.
* Increasing temperature: Generally increases reaction rate up to a point.
* Exceeding optimal temperature: Can denature the enzyme (change its shape), making it non-functional.
* Decreasing temperature: Slows down the reaction rate.
2. pH: Enzymes have an optimal pH range where they function efficiently.
* Changes in pH: Can alter the enzyme's shape, disrupting its ability to bind to the substrate.
* Extreme pH values: Can denature the enzyme.
3. Substrate Concentration: The amount of substrate available can influence enzyme activity.
* Low substrate concentration: The reaction rate increases as more substrate is available to bind to the enzyme.
* High substrate concentration: The reaction rate reaches a plateau when all the enzyme active sites are saturated with substrate.
4. Presence of Activators or Inhibitors:
* Activators: Molecules that increase enzyme activity. They can bind to the enzyme and improve its shape for substrate binding.
* Inhibitors: Molecules that decrease enzyme activity. They can bind to the enzyme and block the active site, prevent substrate binding, or change the enzyme's shape.
* Competitive inhibitors: Compete with the substrate for the active site.
* Non-competitive inhibitors: Bind to a site other than the active site, altering the enzyme's shape and function.
Important note: These factors can work independently or in combination to regulate enzyme activity.
