[22 Aug] S3: Comprehensive Revision II

Sunflower seeds contain a nutrient which is broken down by lipase during germination.

Which test would detect this nutrient?

• Benedict's test

• biuret test

• ethanol emulsion test

• iodine test

The graph shows changing energy levels during a reaction, with and without the presence of the enzyme specific to this reaction.

What is the activation energy of the reaction with the presence of the enzyme?

• A

• B

• C

• D

Which of the following shows the correct elements that make up lipase?

• carbon and oxygen

• carbon, hydrogen and oxygen

• carbon, hydrogen, oxygen and nitrogen

• hydrogen and nitrogen

An unknown food sample was tested with some reagents and the results of the tests are shown in the table.

Which of the following will give these results?

• a bowl of cereal with nuts

• a piece of banana

• a piece of fatty meat

• a piece of plain fried doughnut

Graph X in the figure shows the mass of the product formed when a certain volume of 0.6 mol/dm³ enzyme solution is added to the substrate at a constant temperature and pH.

Which option shows the graph that would be obtained if the same reaction was repeated using a 0.3 mol/dm³ enzyme solution instead?

• A

• B

• C

• D