Proteins as enzymes
- Created by: Natasha Mirchandani
- Created on: 04-11-12 15:26
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- Proteins as enzymes
- speed up chemical reactions + make life possible
- don't change themselves in chemical reactions
- sensitive to surrounding conditions
- lower activation energy
- lactase
- digests lactose by breaking the lactose molecule
- catalyst
- changes the spped of a reaction without changing itself being changed
- enzymes are proteins, but not all proteins are enzymes
- 'ase': suffix used to indicate that a chemical is an enzyme
- chemical reactions require a small concentration of enzymes
- enzymes recognize + interact with specific molecules
- Substrate
- molecule that enzymes interact with
- active site
- region of enzyme that recognizes the substrate
- specific shape + structure determines the molecules it interacts with
- specific shape + structure determines the molecules it interacts with
- product
- end result of an enzyme-catalyzed reaction
- bring molecules together
- speed up reactions by lowering the activation energy
- activation energy
- amount of energy required for the reaction
- Saturated
- when rate eventually reaches its maximum
- when the amount of substrate matches the amount of available enzymes, saturation occurs
- then the rate of reaction no longer increases
- when concentration is low, adding more molecules speeds it up
- Vitamins help produce co- enzymes
- may require Zn + Cu ; co-factors : help with moving electrons, providing energy + binding mols.
- environment influences its activity. Hight temps may break a protein, changing its shape.
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