Umuc biology 102/103 lab 2: the chemistry of life answer key


This is the redress symbolical for UMUC Biology 102/103 Lab 2: The Chemistry of Life. However, this is an Answer Key, which instrument, you should put it in your own opinion. Here are the questions that conquer be answered. Attached is the lab that is largely completed when purchased. Enjoy!

Pre-Lab Questions

1.    Nitrogen fixation is a true course by which passive or unreactive forms of nitrogen are transformed into feasible nitrogen. Why is this course weighty to personality?

 

2.    Given what you accept literary environing the hydrogen bonding shared among nucleic shrills in DNA, which couple is past firm subordinate increasing heat: adenine and thymine, or cytosine and guanine? Interpret why.

 

 

3.    Which of the aftercited is not an fundamental molecule; Methane (CH4), Fructose(C6H12O6), Rosane (C20H36), or Ammonia (NH3)? How do you apprehend?

 

 

 

 

 

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

 

 

 

2. Gelatin Solution

 

 

 

3. Glucose

 

 

 

4. Water

 

 

 

5. Unknown

 

 

 

 

Sample

Initial Color

Final Color

Is Protein Present?

1. Albumin Solution

 

 

 

2. Gelatin Solution

 

 

 

3. Glucose

 

 

 

4. Water

 

 

 

5. Unknown

 

 

 

Table 2: Testing for Proteins Results

 

 

 

Post-Lab Questions

1.    Write a announcement to interpret the molecular commutation of the obscure disruption grounded on the results obtained during standarding after a while 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, interpret why this occurred.

 

3.    Identify the absolute and denying controls used in this illustration. Interpret how each of these controls are used, and why they are compulsory to validate the illustrational results.

 

 

4.    Identify two regions which proteins are material components in the cosmical collection. Why are they weighty to these regions?

 

 

5.    Diet and alimentation are closely linked to the con-over of biomolecules. Describe one manner by which you could adviser your help intake to secure the cells in your collection accept the symbolicals compulsory to employment.

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

 

 

 

2 - Onion

 

 

 

3 - Glucose Solution

 

 

 

4 - Water

 

 

 

5 - Unknown

 

 

 

 

 

Post-Lab Questions

1.    What can you finish environing the molecular make-up of potatoes and onions grounded on the standard you performed? Why capability these helps inclose these pith(s)?

 

2.    What results would you forebode if you standarded ribose, a monosaccharide, after a while 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 Standard Strip Color

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Post-Lab Questions

1.    What is the point of determining the pH of the acetic shrill and the sodium bicarbonate disruption precedently standarding the other household piths?

 

2.    Compare and dissimilarity shrills and bases in conditions of their H+ ion and OH- ion concentrations.

 

3.    Name two shrills and two bases you repeatedly use.