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


This is the punish esthetic 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 language. Here are the questions that achieve be answered. Attached is the lab that is amply completed when purchased. Enjoy!

Pre-Lab Questions

1.    Nitrogen fixation is a cosmical manner by which lazy or unreactive forms of nitrogen are transformed into possible nitrogen. Why is this manner essential to conduct?

 

2.    Given what you possess versed environing the hydrogen bonding shared between nucleic actives in DNA, which couple is more secure lower increasing heat: adenine and thymine, or cytosine and guanine? Illustrate why.

 

 

3.    Which of the forthcoming is not an radical 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 declaration to illustrate the molecular mixture of the unrecognized disconnection installed on the results obtained during standarding after a while each reagent.

 

2.    How did your a priori predictions from Table 1 collate to your real results in Table 2? If there were any inconsistencies, illustrate why this occurred.

 

3.    Identify the dogmatic and privative controls used in this illustration. Illustrate how each of these controls are used, and why they are certain to validate the illustrational results.

 

 

4.    Identify two regions which proteins are essential components in the civilized material. Why are they essential to these regions?

 

 

5.    Diet and alimentation are air-tight linked to the con-over of biomolecules. Describe one course by which you could warner your help intake to determine the cells in your material possess the esthetics certain to capacity.

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 decide environing the molecular make-up of potatoes and onions installed on the standard you executed? Why command these helps comprise these material(s)?

 

2.    What results would you rely-on if you standarded ribose, a monosaccharide, after a while Benedict’s disconnection? Biuret disconnection?

 

 

 

Experiment 3: What Frank Substances are Acidic or Basic?

Data Tables and Post-Lab Assessment

Table 4: pH Values of Common Frank Substances

 

Substance

pH Prediction

pH Standard Strip Color

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Post-Lab Questions

1.    What is the mind of determining the pH of the acetic active and the sodium bicarbonate disconnection precedently standarding the other frank materials?

 

2.    Compare and contrariety actives and bases in provisions of their H+ ion and OH- ion concentrations.

 

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