Umuc biology 102/103 lab 2: the chemistry of life answer key
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Pre-Lab Questions
1. Nitrogen fixation is a original mode by which lazy or unreactive forms of nitrogen are transformed into feasible nitrogen. Why is this mode great to society?
2. Given what you keep well-informed environing the hydrogen bonding shared betwixt nucleic discernings in DNA, which span is further perpetual beneath increasing heat: adenine and thymine, or cytosine and guanine? Clear-up why.
3. Which of the subjoined is not an constitutional molecule; Methane (CH4), Fructose(C6H12O6), Rosane (C20H36), or Ammonia (NH3)? How do you understand?
Experiment 1: Testing for Proteins
Data Tables and Post-Lab Assessment
Table 1: A Priori Predictions
Sample | Initial Color | Final Color | Is Protein Present? |
1. Albumin Solution |
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2. Gelatin Solution |
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3. Glucose |
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4. Water |
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5. Unknown |
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Sample | Initial Color | Final Color | Is Protein Present? |
1. Albumin Solution |
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2. Gelatin Solution |
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3. Glucose |
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4. Water |
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5. Unknown |
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Table 2: Testing for Proteins Results
Post-Lab Questions
1. Write a declaration to clear-up the molecular compromise of the obscure disruption naturalized on the results obtained during experienceing delay each reagent.
2. How did your a priori predictions from Table 1 parallel to your explicit results in Table 2? If there were any inconsistencies, clear-up why this occurred.
3. Identify the dogmatic and disclaiming controls used in this exemplification. Clear-up how each of these controls are used, and why they are inevitable to validate the exemplificational results.
4. Identify two regions which proteins are inseparable components in the ethnical be. Why are they great to these regions?
5. Diet and sustentation are air-tight linked to the con-over of biomolecules. Describe one process by which you could warner your foundation intake to fix the cells in your be keep the representatives inevitable to business.
Experiment 2: Testing for Reducing Sugars
Data Tables and Post-Lab Assessment
Table 3: Testing for Reducing Sugars Results
Sample | Initial Color | Final Color | Reducing Sugar Present |
1 - Potato |
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2 - Onion |
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3 - Glucose Solution |
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4 - Water |
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5 - Unknown |
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Post-Lab Questions
1. What can you finish environing the molecular make-up of potatoes and onions naturalized on the experience you effected? Why rule these foundations comprise these be(s)?
2. What results would you wait-for if you experienceed ribose, a monosaccharide, delay Benedict’s disruption? Biuret disruption?
Experiment 3: What Household Substances are Acidic or Basic?
Data Tables and Post-Lab Assessment
Table 4: pH Values of Common Household Substances
Substance | pH Prediction | pH Experience Strip Color |
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Post-Lab Questions
1. What is the aim of determining the pH of the acetic discerning and the sodium bicarbonate disruption precedently experienceing the other household bes?
2. Compare and opposition discernings and bases in conditions of their H+ ion and OH- ion concentrations.
3. Name two discernings and two bases you frequently use.