Biology Food Test Lab Essay

Essay on Bio 102 Lab Lab 2 Answer Form Blank Spring 2015

1177 WordsFeb 7th, 20155 Pages

UMUC Biology 102/103
Lab 2: The Chemistry of Life
INSTRUCTIONS:
To conduct your laboratory exercises, use the Laboratory Manual that is available in the “Content” section of the Leo classroom or at the eScience Labs Student Portal. Laboratory exercises on your CD are not be updated.
On your own and without assistance, complete this Lab 2 Answer Form electronically and submit it via the Assignments Folder by the date listed on your Course Schedule (under Syllabus).
Type your answers into the shaded boxes provided after the questions. The boxes will expand as you type.
When necessary, insert graphs prepared in Excel, or image files (scans, photos, etc.) into the clear boxes provided.
Save your Lab 2 Answer Form in the following format:…show more content…

Write a statement to explain the molecular composition of the unknown solution based on the results obtained during testing with each reagent. (5 points)
The unknown substance does not contain protein BUT it does contain sugar. Meaning this substance is a sort of carbohydrate.

2. What can you conclude about the molecular make-up of potatoes and onions based on the test you performed? Why might these foods contain these substance(s)? (What=2 points, why=2 points, for a total of 4 points)
Both potatoes and onions contain some sugar in it. These foods might contain these substance to sustain the well-being from going good to bad. These sugars contained in both potatoes and onions are naturally formed.

3. What results would you expect if you tested ribose, a monosaccharide, with Benedict’s solution? Biuret solution? (Benedict’s=2 points, biuret=2 points, for a total of 4 points)
The ribose may change to red, yellow, or green to represent the monosaccharide. Considering ribose does not contain protein the biuret solution would have no effect.

Experiment 3: What

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Materials Required

Real Lab Procedure

  • Place a potato on a tile.
  • Grind or chop the potato into small pieces, using a knife.
  • Using a spatula transfer these pieces of potato into a beaker.
  • Pour some distilled water into the beaker.
  • Place the beaker containing the mixture over a hot plate.
  • Heat the mixture for 5 minutes while continuously stirring it with a glass rod.
  • Take another beaker and cover its mouth with a muslin cloth.
  • Secure the muslin cloth around the mouth of the beaker by tying it with a thread.
  • Filter the solution through this beaker.
  • Now take a clean test tube and pour some of the filtrate into it.
  • Take a few drops of iodine solution using a dropper.
  • Add a couple of these drops into the test solution.

Simulator Procedure (as performed through the Online Labs)

  • You can select the type of test from the ‘Select type of the test’ drop down list.
  • To select a particular food sample, click on the corresponding icon.
  • Click and drag the dropper towards the food sample to pour a few drops of Iodine solution into the test sample.
  • Then drag the dropper back to place it in the Iodine bottle.
  • Based on your observation, you can indicate the presence of starch in the selected sample by clicking on the 'Yes' or 'No' radio button.
  • You can redo the experiment by clicking on the ‘Reset’ button.

Note: If the solution turns to blue-black colour it indicates the presence of starch in the solution.

Observation

The test solution turns blue-black in colour.

Inference

Iodine reacts with starch to form starch/iodine complex which has a blue-black colour. The appearance of blue-black colour confirms the presence of starch in the given food sample.

Precautions

  • While using iodine solution, be careful, as it is toxic if swallowed or inhaled.
  • While heating, care should be taken that the solution does not splash on your face.

Cite this Simulator:

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