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Homeostasis · Paper 1 — Free Biology HL Practice Questions
1FoundationMCQMechanisms of temperature, pH, and water balance1 markPaper 1~2 min
A freshwater amoeba is transferred from its natural pond water into a beaker of distilled water. After 10 minutes, which statement correctly describes the contractile vacuole and explains its state?
Solutions
2MasteryMCQRegulation of blood glucose levels1 markPaper 1~2 min
A healthy volunteer drinks a solution containing 75 g of glucose after an overnight fast. Her blood glucose concentration peaks at 30 minutes and returns to the fasting level by 120 minutes. Which statement best explains the mechanism responsible for this return to the fasting blood glucose concentration?
Solutions
3MasteryMCQRegulation of blood glucose levels1 markPaper 1~2 min
A researcher investigates how insulin affects glucose uptake by liver cells in culture. Insulin is added to one dish of liver cells, and the glucose concentration in the culture medium decreases rapidly. The experiment is repeated with a chemical that blocks vesicle formation; the glucose concentration in the medium remains constant throughout. Which explanation most directly accounts for the result in the second experiment?
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