Enzymes
- Created by: iloverevision:)
- Created on: 01-03-19 18:50
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- Enzymes
- Living cells carry out vast range of chemical reactions
- energy required for chemical reactions to proceed
- called activation energy
- often takes form of heat energy
- reaction only proceeds if reactants are raised to high temperature
- living cells killed by high temperatures
- called activation energy
- energy required for chemical reactions to proceed
- Biological Catalysts
- catalyst is a substance that increases rate of reaction
- enzymes lower rate of reaction by lowering activation energy
- Without enzymes the temp in living cells would be too low to support life
- 37 degrees - body temp
- all metabolic reaction in living organisms catalysed by enzymes
- intracellular or extracellular
- intracellular = inside cell
- extracellular = outside cell
- all chemical reactions in body = metabolism
- intracellular or extracellular
- Mechanisms of Enzyme Action
- enzymes are globular protein molecules
- each enzyme & active site have specific tertiary structure & shape
- enzymes usually only work on 1 type of substance
- substrate
- substrate's molecular shape is complementary to enzyme's active site
- enzyme combines reversibly with substrate to form e-s complex
- enzymes are globular protein molecules
- Living cells carry out vast range of chemical reactions
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