eunice5044
Answered

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An unknown sample is tested for chemical composition. You receive the following results: iodine test = purple; biuret test=blue; Benedict's
test = green; and paper lipid test = greasy spot. Which of the following are present in this sample? (Select all that apply)
Check All That Apply
starch
protein
sugar
Lipids
None of these are present

Sagot :

himaruanuk

Answer:

Starch

Sugar

Lipids

Explanation:

biuret test should be purple if protein present

luisvaschetto

The biomolecules that are present in this sample include starch, sugar and lipids.

  • When starch (a complex carbohydrate) is present in a sample, the iodine test changes from brown to purple.

  • When sugar (a simple carbohydrate) is present in a sample, Benedict's test changes to green color.

  • When lipids (i.e., fat biomolecules) are present in a sample, the paper lipid test generates a greasy spot.

In conclusion, the biomolecules that are present in this sample include starch, sugar and lipids.

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