Megan set down her pencil. Her hand was cramping. The mock paper was finished. But as Dr. Yip collected the answer sheets, she realized something: She hadn't just answered questions. She had touched the reason biology mattered.
“In a long-term study, a population of bacteria was exposed to a sub-lethal dose of an antibiotic. After 50 generations, the minimum inhibitory concentration (MIC) had increased 1000x. Using the theory of natural selection, explain how this occurred. (8 marks) Bonus: Provide a real-world implication beyond the lab.”
It was a data-response question about a novel virus. A graph showed its transmission rate. A table showed the efficacy of a new mRNA vaccine. The final part said: “Using your knowledge of cell biology and immunity, propose one reason why public compliance with vaccination is a greater biological challenge than the virus itself. (4 marks)”
Megan hesitated. The official definition was the maintenance of a constant internal environment. biology mock paper dse
Pens down.
She paused. The pen trembled in her hand. Her own words stared back at her: Untreatable infections. Her grandmother was in the hospital right now. A routine surgery had gone wrong because of a resistant E. coli infection.
Outside, the sun broke through the fog. She took out her phone. One new message from her mother: “Grandma’s fever broke. The antibiotics finally worked.” Megan set down her pencil
She looked back at the paper. One final question, hidden in the margin of Question 14. It wasn’t marked with a point value. It was just a sentence:
She was ready to fight for it.
Easy. She drew the diagram: High blood glucose → Pancreas detects → More insulin → Liver stores glycogen → Glucose drops. Perfect. But as Dr
Then came Section B. Question 8.
Then, for the bonus, she wrote: Real-world implication: Overuse of antibiotics in livestock farming accelerates the evolution of multi-drug resistant pathogens like MRSA, leading to untreatable infections in humans.
She read the stem: A 45-year-old male, Mr. Chan, has a fasting blood glucose of 13.2 mmol/L. Explain the negative feedback mechanism that is failing in his body. (6 marks)
Reason: Herd immunity requires ~85-95% of a population to have antibodies. However, individual variation in immune response (age, genetics, prior health) means the vaccine is not 100% effective for everyone. Non-compliance in healthy individuals indirectly kills the immunocompromised. Therefore, the biggest threat is not the virus’s mutation rate, but the human failure to act as one biological unit.
“What does ‘homeostasis’ mean to you, in one sentence?”