Homeostasis and feedback Quiz
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5 questions, one answer each
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1. Which describes a state of dynamic equilibrium?
- A. A condition that never changes
- B. A condition fluctuating around a set point
- C. A condition that only increases
- D. A condition controlled by positive feedback
2. Which part of a negative feedback loop carries out the response?
- A. Receptor
- B. Coordinator
- C. Effector
- D. Stimulus
3. Why does a fall in pH harm enzymes?
- A. It speeds up the substrates
- B. It alters bonds in the enzyme and changes the active site shape
- C. It increases kinetic energy
- D. It makes water potential rise
4. Which is an example of positive feedback?
- A. Sweating to reduce temperature
- B. Shivering to raise temperature
- C. Vasodilation in hot weather
- D. Oxytocin release during labour
5. What happens to an animal cell placed in a solution of higher water potential than the cell?
- A. It shrinks
- B. It stays the same
- C. It gains water and may burst
- D. It loses solutes