CAIE A-Level Biology A2 12.2.13 Redox Indicator Investigation Questions

any eight from:
1 vary / different / range of, glucose / fructose, concentrations ;
2 control / same, volume of yeast (suspension) ;
3 control / same, volume of glucose (solution) ;
4 control / same, volume / concentration, of indicator (solution) ;
5 control temperature (between $20-45^{\circ} \mathrm{C}$ ) ;
6 oil layer to exclude, air / oxygen ;
7 indicator turns from blue (start / oxidised) to colourless (end / reduced) ;
8 due to, hydrogen atoms / $\mathrm{H}^{+}$/ electrons, from, glycolysis / dehydrogenation / respiration ;
9 time how long it takes for colour change OR fix time interval and measure with colorimeter ;
10 repeat experiment ;
11 calculate mean(s) ;
12 graph with glucose concentration (on x axis) and, time taken / \% absorbance / \% transmission / rate (on y ) ;
13 rate is 1 / t;
14 AVP ;