Biology Unit 3 : Biological molecules

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6 Terms

1
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List the chemical elements that make up carbohydrates, fats and proteins

carbohydrates : CHO

Fats : CHO

Proteins : CHON/S

2
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Procedure for Iodine solution test

Test for STARCH :

  1. add iodine solution to it

  2. if starch is present, the solution will turn a dark blue-black color. 

  3. Negative result is yellow-brown (color of iodine solution)

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procedure for Benedict’s solution test

Test for REDUCING SUGARS :

  1. heat the sample with Benedict's solution

  2. a color change from blue to green, yellow, or orange indicates the presence of a reducing sugar. 

  3. Negative result is blue color (color of benedict solution)

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procedure for biuret test

Test for PROTEIN :

  1. add Biuret solution to the sample

  2. a purple color change indicates the presence of protein. 

  3. Negative result is blue color (color of biuret solution)

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procedure for ethanol emulsion test

  1. mix the sample with ethanol

  2. if fats or oils are present, a cloudy emulsion will form when it is added to water

  3. negative result is no change

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Procedure for DCPIP test

  1. add DCPIP solution to the sample

  2. if vitamin C is present, the blue DCPIP solution will become colorless.