Enzymes and metabolic pathways - Chemical reactions: Breaking and making covalent bonds
3 important questions on Enzymes and metabolic pathways - Chemical reactions: Breaking and making covalent bonds
What are the three energy changes in chemical reactions?
Thermoneutral reactions; output of energy = activation energy
Exothermic reaction: output of energy < activation energy
Endothermic reaction: Output of energy > activation energy
What does a catalyst do?
Increases the rate at which a reaction comes to equilibrium without being consumed in the reaction. Small amount of catalyst now can effect the reaction of many thousands of molecules of substrate.
How do catalysts affect the rate of reaction?
1. Providing a surface f0r molecules to undergo reaction.
2. Providing a microenvironment for reactants (different from solution as whole)
3. Participating in the reaction by withdrawing electrons from, or donating electrons to, covalant bonds.
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