Biological Molecules - Tests Flashcards

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1
Q

what solution is used to test for starch

A

iodine

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2
Q

if starch is present what colour will the solution go

A

blue-black

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3
Q

what solution do we use to test for proteins

A

biurets solution

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4
Q

if protein is present what colour will the solution go

A

lilac

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5
Q

what solution do we use to test for lipids

A

ethanol

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6
Q

what else do we add to the solution to test for lipids

A

water

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7
Q

what must you do to the lipid testing solution

A

shake it

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8
Q

if lipids are present what colour will the solution go

A

white cloudy emulsion

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9
Q

what are the 2 different categories of sugars

A

reducing and non reducing

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10
Q

what is the definition of a reducing sugar

A

they can donate an electron to another molecule

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11
Q

give an example of a reducing sugar

A

all monosaccharides

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12
Q

what solution do we use to test for reducing sugars

A

benedicts solution

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13
Q

what must we do after adding benedicts to our reducing sugar sample

A

place the test tube in boiling water for 5 mins

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14
Q

if a reducing sugar is present what colour does the solution go

A

a brick red precipitate forms

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15
Q

give an example of a non reducing sugar

A

sucrose

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16
Q

what solution do we use to test for a non reducing sugar

A

hydrochloric acid
(gently boil for 5 mins)

17
Q

if a non reducing sugar is present what color does it go

A

orange