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Lab 17 Nutrition BIO202L

Student Name: Click here to enter text. Access Code (located on the lid of your lab kit): Click here to enter text.

Pre-Lab Questions:

”1. How do the intake of nutrients and expenditure of energy relate to a metabolic level?”

Different nutrients have different calorific content. During exercise, your body requires more energy so it is ideal to consume food with high calorific content such as carbohydrates and fats. In the more intense activities, your body’s metabolism increases thus requires more calories for energy.

”2. Do you think you take in more calories than you burn in a day? Why or why not? ”

Yes, I do because I’m a stress eater and I can’t always find the time to exercise.

Experiment 1: Tracking Your Nutrition

Macronutrient Graph Screenshot:

”Analysis: According to the chart, I ate consumed more calories than needed everyday. I am not surprise by this result though because I know that I am a snacker and I tend to drink a lot of sugarly drink throughout the day. To improve my nutrition, I would eliminate sugarly drinks from my diet and drink more water. I would also exercise into my daily routine.

Experiment 2: Testing for Reducing Sugars

Table 1. Testing for Proteins Results

Sample Initial Color Hypothesis

(Protein +/-) Final Color

Protein Present?

Albumin (1) Light yellow + Violet Yes

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Lab 17 Nutrition BIO202L

Sample Initial Color Hypothesis

(Protein +/-) Final Color

Protein Present?

Gelatin (2) Dark yellow + Violet

Yes

Glucose (3) Clear - Blue No

Water (4) Clear - Blue No

Table 2. Testing for Reducing Sugars Results

Sample Initial Color Hypothesis (Reducing Sugar +/-)

Final Color Reducing

Sugar Present?

Potato (1) Off white + Yellow Yes

Onion (2) Off white + Green Yes

Glucose (3) Clear + Red Yes

Water (4) Clear - Blue No

Table 3. Testing for Starch Results

Sample Initial Color Hypothesis (Starch +/-)

Final Color Starch

Present?

Potato (1) Off white +

Dark purple Yes

Onion (2) Off white - Brown No

Starch (3) Murky white + Dark purple Yes

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Lab 17 Nutrition BIO202L

Sample Initial Color Hypothesis (Starch +/-)

Final Color Starch

Present?

Water (4) Clear -

Brown No

Table 4. Testing an Unknown - Proteins

Sample Initial Color Hypothesis

(Protein +/-) Final Color

Protein Present?

Positive Control (1): Light yellow + Violet Yes

Negative Control (2): Clear - Blue No

Unknown (3) Murky white

- Blue No

Table 5. Testing an Unknown – Reducing Sugars

Sample Initial Color Hypothesis (Reducing Sugar +/-)

Final Color Reducing

Sugar Present?

Positive Control (1): Off white + Green Yes

Negative Control (2): Clear - Blue No

Unknown (3) Murky white + Orange Yes

Table 6. Testing an Unknown – Starch

NOTE: Before filling in this table, take a screenshot of your test tubes to include at the

end of this document.

Sample Initial Color Hypothesis (Starch +/-)

Final Color Starch

Present?

Positive Control (1):

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Lab 17 Nutrition BIO202L

Sample Initial Color Hypothesis (Starch +/-)

Final Color Starch

Present? Off white

+ Orange No

Negative Control (2): Clear - Orange No

Unknown Murky white

+ Dark purple Yes

Post-Lab Questions

”1. Write a statement to explain the molecular composition of the unknown solution based on the

results obtained during testing with each reagent. ”

The unknow substance contains both sugar and starch but does not contain protein.

”2. What can you conclude about the molecular make-up of potatoes and onions based on the tests you

performed? Why might these foods contain these substances? ”

Both potatoes and onions contain some sugar in it; however, only potatoes contain starch.

”3. What results would you expect if you tested ribose, a monosaccharide, with Benedict’s solution?

What results would you expect if you tested it with IKI? ”

Ribose is a simple sugar. When added with Benedict’s solution, it should turn orange which indicate that reducing sugar is present. It should turn dark blue with IKI which indicate that starch is present.

”4. Diet and nutrition are closely linked to the study of biomolecules. How should you monitor your food

intake to insure the cells in your body have the materials necessary to function? ”

I used to monitor my food intake very closely through MyFitnessPal app. I found that it helped me tremendously in tracking my food/water intake and exercises. Everyone is different

so food/water/vitamins intake and exercise level may varies but this app is tailored to match your lifestyle and goal. Overall, I’d recommend this method of tracking if one want to eat healthy and stay healthy.

”Insert a screenshot of your test tubes after the starch test from “Testing An Unknown”: ”

This study source was downloaded by 100000792411801 from CourseHero.com on 11-20-2021 10:07:30 GMT -06:00

https://www.coursehero.com/file/59039396/Lab-17-Worksheet-DONEdocx/

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Lab 17 Nutrition BIO202L

This study source was downloaded by 100000792411801 from CourseHero.com on 11-20-2021 10:07:30 GMT -06:00

https://www.coursehero.com/file/59039396/Lab-17-Worksheet-DONEdocx/

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