Experiment 9.3

What is the aim of the experiment

• to study the digestion of lipid by lipase

• to study the presence of lipase

• to study the digestion of lipase by lipid

• to study the digestion of lipid by pepsin

Which of the following is not the materials needed for the experiment

• sodium carbonate solution

• phenolphthalein indicator

• iodine solution

• starch suspension

what is the purpose of adding dishwashing liquid into each test tube

• to test the presence of lipase

• to provide an alkaline medium for lipase action

• to break up the lipids in cooking oil into tiny fat droplets

which of the following is the correct responding variables of this experiment

• colour changes in iodine solution and Benedict’s solution

• time taken for phenolphthalein indicator to turn from pink to colourless

• volume and concentration of starch suspension, volume and concentration of saliva

• volume and concentration of lipase, volume and concentration of milk

what is the most accurate hypothesis for the experiment

• lipase break down lipids into fatty acids and glycerol

• lipids hydrolyses lipase into fatty acids and glycerol

• lipase hydrolyses lipids into fatty acids and glycerol

explain why does the colour of phenolphthalein indicator remains pink after the experiment

• there is no presence of cooking oil

• the solution contains 1ml of boiled lipase

• there is no presence of salivary amylase

• there is no presence of lipase

what is the purpose of adding sodium bicarbonate solution

• to provide an alkaline medium for lipase action

• to turn the phenolphthalein indicator from pink to colourless

• to inhibit the lipase action

• to reduce the time taken for phenolphthalein indicator to turn from pink to colourless