Question

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lab: identifying nutrients
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
by adding
to the three test
.

if the mystery food sample contained the nu
to the same color as the
.

in this lab, the only test that turned out positive was for
.

Explanation:

To solve this fill - in - the - blank problem related to a lab on identifying nutrients, we analyze the context of each blank:

First Blank (the action done to the test tubes)

In a nutrient - testing lab, we test for nutrients by adding indicators to the test tubes. Indicators are substances that change color in the presence of specific nutrients, so this makes sense for the first blank.

Second Blank (what the color change indicates)

If the mystery food sample has the same color as the positive control, it means the nutrient (that the positive control is testing for) is present in the mystery sample. The positive control is a sample known to contain the nutrient, so matching its color after adding the indicator shows the presence of the nutrient.

Third Blank (the nutrient - related result)

In such labs, common nutrients tested for include carbohydrates, proteins, lipids, and sugars. A typical positive test (for example, for simple sugars using Benedict's reagent or for starch using iodine) would show a color change. If we assume a common positive test, say for sugars (or another specific nutrient depending on the lab protocol), but generally, the key here is that the positive test is for a nutrient (and more specifically, a type of nutrient like sugar, starch, protein, or lipid). Given the context, a likely answer for the third blank (the nutrient the positive test was for) could be something like sugar (or other specific nutrients like starch, protein, lipid depending on the lab's focus). But following the general lab procedure for nutrient testing:

1. The first blank: We add "indicators" to the test tubes to test for nutrients.
2. The second blank: If the color matches the "positive control", the nutrient is present.
3. The third blank: A common positive test in such labs is for "sugars" (or other nutrients like starch, protein, lipid).

Final Answers (assuming a common lab setup for nutrient testing)

• First blank: indicators
• Second blank: positive control
• Third blank: sugars (or other specific nutrients like starch, protein, lipid depending on the lab)

Answer:

To solve this fill - in - the - blank problem related to a lab on identifying nutrients, we analyze the context of each blank:

First Blank (the action done to the test tubes)

In a nutrient - testing lab, we test for nutrients by adding indicators to the test tubes. Indicators are substances that change color in the presence of specific nutrients, so this makes sense for the first blank.

Second Blank (what the color change indicates)

If the mystery food sample has the same color as the positive control, it means the nutrient (that the positive control is testing for) is present in the mystery sample. The positive control is a sample known to contain the nutrient, so matching its color after adding the indicator shows the presence of the nutrient.

Third Blank (the nutrient - related result)

In such labs, common nutrients tested for include carbohydrates, proteins, lipids, and sugars. A typical positive test (for example, for simple sugars using Benedict's reagent or for starch using iodine) would show a color change. If we assume a common positive test, say for sugars (or another specific nutrient depending on the lab protocol), but generally, the key here is that the positive test is for a nutrient (and more specifically, a type of nutrient like sugar, starch, protein, or lipid). Given the context, a likely answer for the third blank (the nutrient the positive test was for) could be something like sugar (or other specific nutrients like starch, protein, lipid depending on the lab's focus). But following the general lab procedure for nutrient testing:

1. The first blank: We add "indicators" to the test tubes to test for nutrients.
2. The second blank: If the color matches the "positive control", the nutrient is present.
3. The third blank: A common positive test in such labs is for "sugars" (or other nutrients like starch, protein, lipid).

Final Answers (assuming a common lab setup for nutrient testing)

• First blank: indicators
• Second blank: positive control
• Third blank: sugars (or other specific nutrients like starch, protein, lipid depending on the lab)