According to the induced fit model, which of the following occur?
I. The enzyme changes shape slightly to better fit the substrate
II. The active site becomes rigid and locked
III. The enzyme-substrate complex stabilizes the transition state
A student investigates catalase breaking down hydrogen peroxide into water and oxygen. Which sequence correctly describes the experimental process?
Add catalase to hydrogen peroxide
Start timer
Collect oxygen in a gas syringe
Measure volume after 1 minute
What is the benefit of enzymes in cellular reactions?
Measurements were made before and after a 10-minute incubation. Which conclusion is supported?
How do enzymes increase the likelihood that a reaction will occur?
Practice IB Biology Topic C1.1 Enzymes and Metabolism with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for C1.1 Enzymes and Metabolism and mirrors Paper 1A, 1B, 2 style where relevant.
Get instant solutions, detailed explanations, and build confidence with questions aligned to IB examiner expectations.
| Measurement | Before | After |
|---|
| Polysaccharide / arbitrary units | 9.0 | 3.0 |
| Reducing sugar / arbitrary units | 1.0 | 7.0 |
| Oxygen uptake / μmol min⁻¹ | 4.0 | 4.0 |
