A student conducted an experiment on an unknown food to...

A student conducted an experiment on an unknown food to determine the presence of macromolecules. The results are as follows: Benedict's test = blue, Iodine test = dark red, Biuret test = violet, Sudan IV = dark red. Using the indicator chart below and the information in the chart above, which macromolecules were present? Select all that apply. a. carbohydrates b. lipids c. nucleic acids d. proteins INDICATOR Benedict's Iodine Biuret Sudan IV NEGATIVE TEST blue dark red blue dark red POSITIVE TEST orange black violet reddish-orange

Transcript

00:01 Okay, well, so before we go further to this question here, we need to understand that the food test is a very important lab procedure when you're trying to analyze for substances, all right? and even before you go further, i just need to outline in summary.

00:24 Okay, so this is a food test and i want us to agree on one thing that so done for a test is precisely used to test for lipids, which means that a positive test.

00:55 Okay.

00:58 So let's say that we have a positive here and we have a negative there, okay? okay, let me do some kind of a table to enable us understand more, okay? so sudan4 test for lipids.

01:20 So if a reagent is positive or if a test is positive definitely, because for instance, this test procedure is just going to add a few drops of sudan4 into a test solution.

01:34 You know, this is sudan4, it's a dye that will specifically stay in lipins.

01:40 So which means that if no lipids are present, then the die will sink to the bottom of the testing.

01:45 So negative test will give a dark red, but then a positive test will give a reddish orange.

02:05 Okay.

02:07 And then the second thing from this is benedict's.

02:17 Benedict's test.

02:18 This is for sugars, you know, simple sugars here, which means that in this kind of an arrangement here, you expect that you're going to test for the design sugars, which means, for instance, the positive is going to give you orange according to the instructions, according to that table we are given here, okay? or benedict's test for positive will give you orange color, and for negative it will give you blue.

03:05 Then moving on to another test here is iodine.

03:11 Iodine is specifically for starch.

03:16 It means that a positive reaction will give you a black, solid black color.

03:23 A negative will give you a dark red color...

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