Water potential and enzyme activity are core to 9700 practical and planning papers. Weigh potato cylinders, find the concentration with no change in mass, time amylase at different temperatures, then practise the control variables and explanations examiners expect.
This trainer needs JavaScript.
Readings recorded to the precision of the instrument and calculated values to sensible significant figures.
The concentration giving no change in mass has the same water potential as the cells; read it from the line where it crosses 0%.
Rate = 1 ÷ time, in s⁻¹, with the optimum taken from the data.
Temperature with a thermostatically controlled water bath, pH with a buffer, and fixed volumes, concentrations and sizes.
Osmosis described in terms of water potential; denaturation in terms of the active site.
The marking follows the conventions in published Cambridge mark schemes. The experiments, readings and wording on this page are our own.