reflecting on the laboratory procedure
throughout the reflection, make sure you have a copy of the student guide (pdf or word) and your data table.
you tested for the presence of four different indicators by adding nutrients to the three test tubes.
if the mystery food sample contained the nutrient, then it would change to the same color as the positive control.
in this lab, the only test that turned out positive was for
proteins
lipids
polysaccharides
monosaccharides

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Accepted Answer

# Brief Explanations:
1. First blank: In a nutrient testing lab, we use "indicators" to test for nutrients. Indicators are substances that change color to show the presence of a particular nutrient. So the first blank should be "indicators".
2. Second blank: We add "nutrients" (or more precisely, the samples containing nutrients) to the test tubes. Wait, no—actually, we add the "samples" (the mystery food sample, positive control, negative control) to the test tubes with the indicators. But looking at the options, the second blank is about what we test for, so we test for "nutrients" by adding indicators. Wait, the sentence is "You tested for the presence of four different [blank] by adding [blank] to the three test tubes." So first blank (after "different"): nutrients (since we test for nutrients). Second blank: indicators (since we add indicators to test for nutrients). Then "If the mystery food sample contained the nutrient, then it would change to the same color as the [blank]." The positive control is the one that contains the nutrient, so it would change to the same color as the "positive control". Then "In this lab, the only test that turned out positive was for [blank]." Looking at the dropdown, the options are proteins, lipids, polysaccharides, monosaccharides. Typically, in basic nutrient tests, if we consider common tests: Biuret test for proteins (turns purple), Benedict's for reducing sugars (monosaccharides/polysaccharides with reducing ends), Sudan for lipids, Iodine for starch (polysaccharide). But if the positive control for a test (say Biuret for proteins) was positive, and the mystery sample matched the positive control's color, then the positive test was for proteins. So putting it all together:

First dropdown (after "four different"): nutrients (wait, no, the first dropdown in the image: the first blank is "indicators" or "nutrients"? Wait the image shows: "You tested for the presence of four different [dropdown] by adding [dropdown] to the three test tubes." So first dropdown: nutrients (because we test for nutrients), second dropdown: indicators (because we add indicators to test nutrients). Then "If the mystery food sample contained the nutrient, then it would change to the same color as the [dropdown]." The dropdown here is "positive control" (since positive control has the nutrient, so the color matches positive control). Then "In this lab, the only test that turned out positive was for [dropdown]." The dropdown options are proteins, lipids, polysaccharides, monosaccharides. Let's assume the lab was testing for proteins (Biuret test: positive control is a protein solution, negative is water, mystery sample—if it turned positive, it's proteins). So:

1. First blank: nutrients (wait, no, the first dropdown in the image: the first box is "indicators" or "nutrients"? Wait the user's image has: "You tested for the presence of four different [blank] by adding [blank] to the three test tubes." The first blank (dropdown) options: maybe "nutrients" (since we test for nutrients), second blank: "indicators" (since we add indicators). Then "If the mystery food sample contained the nutrient, then it would change to the same color as the [blank]." The blank is "positive control" (since positive control has the nutrient, so color matches). Then "In this lab, the only test that turned out positive was for [blank]." The blank options: proteins, lipids, polysaccharides, monosaccharides. Let's go step by step:

- First dropdown (after "four different"): nutrients (we test for nutrients like proteins, lipids, carbs)
- Second dropdown (after "adding"): indicators (we add indicators to test nutrients)
- Third dropdown (after "same color as the"): positive control (positive control has the nutrient, so color matches)
- Fourth dropdown (after "was for"): proteins (assuming the lab's positive test was for proteins)

So filling in:

1. You tested for the presence of four different **nutrients** by adding **indicators** to the three test tubes.
2. If the mystery food sample contained the nutrient, then it would change to the same color as the **positive control**.
3. In this lab, the only test that turned out positive was for **proteins**.

# Answer:
1. nutrients
2. indicators
3. positive control
4. proteins

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