BI-162
Lock-and-key model
Biology · Secondary 3 · Medium · Lock-and-key model
A student wants to show that a colourless liquid from the liver contains the enzyme catalase. Which procedure would best test whether the liquid is an enzyme?
- Add iodine solution and look for a blue‑black colour.
- Boil the liquid, cool it, then add it to hydrogen peroxide and look for bubbles.
- Freeze the liquid, then add it to starch solution and look for colour change.
- Mix the liquid with water and measure any change in pH.
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