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describe how you would test a sample of food to show it contains protein. give the reason for any safety precautions you would take.
- grinding up the food
- add biuret to food sample
- if protein is present then biuret will go from blue to purple/lilac
describe how a student could test cows milk to show whether it contains protein and different types of carbohydrates.
- biuret tests for protein
- add biuret to milk
- solution will turn from blue to lilac if protein is present
- iodine will test for starch
add iodine to milk
solution will turn from orange to black if carbohydrate is present.
benedict's tests for sugars
Add to milk and heat to 70 degrees
solution will turn from brick red to green is positive
it is important that the bungee card used is appropriate for the students weight. give 2 reasons why
- bungee card may snap
- rope may extend to much
before the student jumps from the bridge, he has a store of energy. when he his falling the students store of energy increases.
write the equation that links kinetic energy, mass and speed.
1/2 x mass x speed 2
cells in plant roots do not photosynthesis. why
they have no chloroplasts
suggest why blood flow through the coronary arteries is lower in people with coronary heart disease.
because arteries are narrower and clogged with fat
explain one way the removal of disolved sugars from the stem of the plant causes stunted growth
less sugars for respiration so less energy released
give one metabolic reactions in cells
formation of proteins
formation of glycogene
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