Factors Affecting the Rate of Enzyme Activity (Leaving Cert Biology): Flashcards
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Three factors affecting enzyme activity rate
Three factors affecting enzyme activity rate
Temperature, pH, enzyme inhibitors
Optimum temperature
Optimum temperature
Temperature at which an enzyme works best
Enzyme activity rate at 0°C
Enzyme activity rate at 0°C
Zero (water freezes, molecules cannot move)
Effect of rising temperature on enzyme activity
Effect of rising temperature on enzyme activity
Rate increases (molecules move faster, more collisions)
Temperature above which human enzymes denature
Temperature above which human enzymes denature
Above 37°C
Denaturation
Denaturation
Active site destroyed permanently; enzyme stops working
Optimum temperature range for plant enzymes
Optimum temperature range for plant enzymes
25°C to 35°C
Optimum pH
Optimum pH
pH at which an enzyme works best
pH scale range
pH scale range
0 to 14
Optimum pH range for many enzymes
Optimum pH range for many enzymes
pH 6 to 8
Purpose of buffer solution
Purpose of buffer solution
Keeps pH constant in experiments
Enzyme inhibitors
Enzyme inhibitors
Chemicals that attach to enzyme and destroy its shape
Cyanide as enzyme inhibitor
Cyanide as enzyme inhibitor
Blocks enzymes involved in respiration
Heavy metal enzyme inhibitors (examples)
Heavy metal enzyme inhibitors (examples)
Mercury and lead
Effect of extreme pH on enzymes
Effect of extreme pH on enzymes
Enzyme becomes denatured (active site changes permanently)