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11 Cards in this Set

  • Front
  • Back
What is an enzyme?
An organic catalyst that controls metabolic reactions
Describe the two models of enzyme reactions
The lock and key model - a specific enzyme fits onto a specific substrate

Induced fit - enzyme changes slightly to fit with the substrate
Identify the three conditions that affect enzyme activity
Temperature - too high it denatures, too low it slows the reaction down


Change in substrate concentrations
What is the maintenance of a stable internal environment known as?
What are the two stages of homeostasis?
Detecting changes from the stable state

Counteracting changes from the stable state
What is the stimulus-response pathway? (Use example of temperature)
Stimulus (cold) - Receptor (thermoreceptor) - Central Nervous System (cause reaction) - Effector (muscle or gland) - Response (shivering)
Describe the negative feedback system (use example of temperature)
Movement away from an ideal state causes a return back to the ideal state. e.g. Shivering
What organisms use internal metabolic processes to control their body temperature?
What organisms use energy from their environment to regulate their body temperature?
Identify ecto-and-endothermic responses to temperature change
Kangaroos lick their paws to cool the blood that is close to the skin

Bogong moths supercool their body in order to avoid freezing
Identify plant responses to temperature change (Hot and Cold)
Hot: Eucalyptus leaves hang vertically to reduce sun exposure

Cold: Camellia plants have frost-tolerant leaves