In the same test (2 cm3 of 2.0M hydrogen peroxide added to 2 cm3 of active, unboiled yeast suspension), what is seen in the reaction mixture itself, separate from the glowing-splint test?
Model answer
bubbles
Also accepted: bubbles of gas, effervescence, froth
Explanation
As catalase breaks down hydrogen peroxide, oxygen gas is released as bubbles, seen as effervescence or froth forming above the mixture.
Derived from ZIMSEC Biology Paper 4 (Practical Test), Jun 2004, Q1