The Roles of Enzymes (OCR A-Level Biology A): Flashcards
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Catalyst
Catalyst
Substance that speeds up reactions without being altered
Enzyme
Enzyme
Protein molecule that acts as a catalyst
Intracellular enzymes
Intracellular enzymes
Enzymes that catalyse reactions within cells
Extracellular enzymes
Extracellular enzymes
Enzymes that catalyse reactions outside cells
Active site shape relative to substrate
Active site shape relative to substrate
Complementary (not identical)
Induced-fit hypothesis
Induced-fit hypothesis
Active site changes shape during substrate binding
Activation energy
Activation energy
Energy needed to overcome barrier for reaction to occur
Q10 (temperature coefficient)
Q10 (temperature coefficient)
Ratio of activities at temperatures 10°C apart
Denaturation
Denaturation
Change in tertiary structure; enzyme no longer functions
High substrate conc. effect on rate
High substrate conc. effect on rate
Rate plateaus as all active sites occupied (saturated)