Biology Mock Paper Dse May 2026

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

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) biology mock paper dse

Then came Section B. Question 8.

“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.” Megan hesitated

“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.” Chan, has a fasting blood glucose of 13