B3 Organisation and the digestive system Flashcards

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1
Q

what is the food test for protein

A

biuret solution, a positive result is it turning purple and a negative result is it staying blue

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2
Q

what is the food test for lipids (fats)

A

ethanol, a positive result is a milky white suspension layer and a negative result is a clear solution

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3
Q

what is the food test for starch

A

iodine solution, a positive result is it turning blue/black and a negative result is it staying orange.

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4
Q

what is the food test for glucose

A

benedicts solution and heat, a positive result is it turning red and a negative result is it staying blue

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5
Q

what enzyme breaks down starch

A

amylase (a carbohydrase)

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6
Q

what enzyme breaks down proteins

A

pepsin (a protease)

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7
Q

what enzyme breaks down lipids

A

lipases

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8
Q

what does protein break down into

A

amino acids

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9
Q

what do lipids break down into

A

fatty acids and glycerol

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10
Q

what does starch break down into

A

simple sugars (glucose)

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11
Q

where is pepsin produced

A

stomach, pancreas and small intestine

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12
Q

where is amylase produced

A

salivary glands, pancreas and small intestine

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13
Q

where is lipases produced

A

pancreas and small intestine

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14
Q

what’s the optimum ph for pepsin, amylase and lipases

A

pepsin- 3
amylase- 7
lipases- 8

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15
Q

whats an enzyme

A

a protein which is a biological catalyst that speeds up a chemical reaction

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16
Q

what is the metabolism

A

the sum of all the reactions in a cell or the body

17
Q

what is an active site

A

the site on enzymes where the reactants bind

18
Q

what does it mean when an enzyme denatures

A

changes to the shape of the active site so the substrate no longer fits the active site

19
Q

what can cause an enzyme to denature

A

the temperature being too high
ph being too high or too low