Testing for the 4 large molecules

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Biology

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7 Terms

1
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Positive control

Used to determine if the tested sample is positive for the substance of interest

2
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Negative control

If an unknown sample does not contain the substance of interest it will look similar to this

3
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Protein

Biuret reagent

Positive: pinkish to pale lavender

Negative: pale blue

4
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Amino acid

Smallest unit of protein

5
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Reducing sugars

Benedict’s reagent

Positive: Orange reddish

Negative: turquoise blue to dull bluish purple

6
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Starch

Iodine test

Positive: dark purple to blueish black

Negative: amber reddish

7
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Lipids

Sudan IV Test

Positive: Rosy pink

Negative: Pink