COMMAND WORD · BIOLOGY
Say the result you expect from a pattern or a principle, and keep the condition attached to it.
If A, then B, assuming C.
Original question
In an illustrative experiment the rate of an enzyme rises from 20 °C to 40 °C. Predict the effect of going from 20 °C to 30 °C.
Annotated answer
AThe rate is still rising between 20 °C and 40 °C. BThe rate at 30 °C should be higher than the rate at 20 °C. CThis assumes nothing else is changed and the enzyme has not passed its optimum.
The labels match the frame. Read them in order. This is one accurate route, not the only one.
“It will change” is not a prediction. Say what you expect.
Writing “it depends” and stopping.
Original practice
Mark points shown after marking
A partially permeable membrane separates pure water from a sucrose solution. Predict the direction of net water movement.
(1)State one assumption you made.
(1)Total for this question: 2 marks
Net water movement is from the pure water into the sucrose solution, because the sucrose solution has the lower water potential. This assumes the membrane lets water through and not the sucrose, and that the temperature is the same on both sides.
