Biology Mock Paper Dse Apr 2026

She turned the page.

She didn’t need to revise for this one. She thought of the news, the arguments online, the herd immunity threshold falling apart. She wrote:

She was ready to fight for it.

Megan blinked hard. The sterile exam hall suddenly felt real. This wasn't just about getting a Level 5**. The mock paper wasn't just a rehearsal. It was a map of a crisis happening in real time. biology mock paper dse

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)

Easy. She drew the diagram: High blood glucose → Pancreas detects → More insulin → Liver stores glycogen → Glucose drops. Perfect.

But her grandmother’s face flashed in her mind. The ventilator. The resistant bacteria. The doctors fighting to bring her body back to balance. She turned the page

“Pens down. Pencils up for MC questions,” the invigilator, Dr. Yip, said, his voice flat as a petri dish. “You have one hour and thirty minutes. Begin.”

But then, the killer.

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.

Dr. Yip’s voice cut through her thoughts. “Five minutes remaining.”

She wrote the textbook answer: Random mutation → Some bacteria have resistance gene → Sub-lethal dose kills non-resistant → Resistant bacteria survive and reproduce → Allele frequency increases. She wrote: She was ready to fight for it

Megan hesitated. The official definition was the maintenance of a constant internal environment.