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11 Cards in this Set
- Front
- Back
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What is an enzyme?
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An organic catalyst that controls metabolic reactions
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Describe the two models of enzyme reactions
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The lock and key model - a specific enzyme fits onto a specific substrate
Induced fit - enzyme changes slightly to fit with the substrate |
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Identify the three conditions that affect enzyme activity
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Temperature - too high it denatures, too low it slows the reaction down
pH Change in substrate concentrations |
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What is the maintenance of a stable internal environment known as?
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Homeostasis
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What are the two stages of homeostasis?
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Detecting changes from the stable state
Counteracting changes from the stable state |
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What is the stimulus-response pathway? (Use example of temperature)
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Stimulus (cold) - Receptor (thermoreceptor) - Central Nervous System (cause reaction) - Effector (muscle or gland) - Response (shivering)
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Describe the negative feedback system (use example of temperature)
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Movement away from an ideal state causes a return back to the ideal state. e.g. Shivering
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What organisms use internal metabolic processes to control their body temperature?
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Endotherms
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What organisms use energy from their environment to regulate their body temperature?
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Ectotherms
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Identify ecto-and-endothermic responses to temperature change
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Kangaroos lick their paws to cool the blood that is close to the skin
Bogong moths supercool their body in order to avoid freezing |
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Identify plant responses to temperature change (Hot and Cold)
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Hot: Eucalyptus leaves hang vertically to reduce sun exposure
Cold: Camellia plants have frost-tolerant leaves |
