Why do enzymes only catalyse specific reactions?
Enzymes are made up of specific amino acid sequences. Bonds form between amino acids in the chain in specific places. Hydrogen bonds form and fold the sequence into a secondary structure. Ionic bonding, disulphide bridges and more hydrogen bonds form to pull the chain into a 3D tertiary structure. This 3D structure has a very specific shape based on this sequence of amino acids and the bonds which form, and this shape is complementary to only one substrate, so will only catalyse the correct reaction.
JD
Related Biology A Level answers
All answers ▸When a nerve impulse arrives at a synapse, it causes the release of neurotransmitter from vesicles in the presynaptic knob. Describe how.
Can you explain the different valves of the heart and why they are important?
Two species of frogs, each found on one of two neighbouring islands yet with the same genus, are identified. Scientists believe that the two species originated from a common ancestor. Explain how these species could have evolved.
Explain a mechanism for the transporting and loading of sugars in the phloem. [6]