9700 · 3.1
Mode of action of enzymes
Ever wondered how your body performs countless chemical reactions every second, all at a steady, moderate temperature? The secret lies in **enzymes** – nature's incredible biological **catalysts**! These protein powerhouses are essential for life, orchestrating everything from digestion to DNA replication. Let's delve into their fascinating **mode of action** and unlock the principles that make them so vital. Key points align with **A-Level Notes** 9700 Biology chapter **3** (topic **3.1**). Notes and diagrams from **A-Level Notes** chapter **3**, topic **3.1** (1 pages).
Need to know
What you need to know
- Enzymes are globular proteins that catalyse metabolic reactions.
- They function as biological catalysts by lowering the activation energy.
- Enzymes are highly specific due to the unique 3D shape of their active site.
- The active site is complementary to the substrate, forming an enzyme-substrate complex.
- The induced-fit model describes the flexible nature of the active site.
- Enzymes have hydrophilic R-groups on the outside, ensuring they are soluble.
Explanation
Mode of action of enzymes
- Enzymes are globular proteins that catalyse metabolic reactions.
- They function as biological catalysts by lowering the activation energy.
- Enzymes are highly specific due to the unique 3D shape of their active site.
- The active site is complementary to the substrate, forming an enzyme-substrate complex.