........................................................................................................................... (2) (Total 8 marks) Q6. A group of students investigated the effect of temperature on the action of the enzyme lipase. The students: put 1 cm3 of lipase solution into a test tube • put 5 cm3 of lipid into a different test tube • put both tubes in a water bath at 5 C for 3 minutes • mixed the lipid with the lipase solution. • Every five minutes the students tested a sample of the mixture for lipid, until no lipid remained. The students repeated the experiment at different temperatures. (a) To make their investigation fair the students needed to control some variables. Give one variable the students controlled in their investigation. ........................................................................................................................ (1) (b) The tubes of lipase solution and lipid were kept separately in the water bath for 3 minutes before mixing. Why? Tick ( ) one box. So that the lipase broke down the lipid quickly So that the lipase and the lipid reached the right temperature To give enough time for the lipase to down the lipid To give enough time for the water bath to heat up
........................................................................................................................... (2) (Total 8 marks) Q6. A group of students investigated the effect of temperature on the action of the enzyme lipase. The students: • put 1 cm3 of lipase solution into a test tube • put 5 cm3 of lipid into a different test tube • put both tubes in a water bath at 5 C for 3 minutes • mixed the lipid with the lipase solution. Every five minutes the students tested a sample of the mixture for lipid, until no lipid remained. The students repeated the experiment at different temperatures. (a) To make their investigation fair the students needed to control some variables. Give one variable the students controlled in their investigation. ........................................................................................................................ (1) (b) The tubes of lipase solution and lipid were kept separately in the water bath for 3 minutes before mixing. Why? Tick ( ) one box. So that the lipase broke down the lipid quickly So that the lipase and the lipid reached the right temperature To give enough time for the lipase to down the lipid To give enough time for the water bath to heat up
b3_digestion_exam_qs.docx