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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”: ”
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https://www.coursehero.com/file/59039396/Lab-17-Worksheet-DONEdocx/
Lab 17 Nutrition BIO202L
This study source was downloaded by 100000792411801 from CourseHero.com on 11-20-2021 10:07:30 GMT -06:00
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