• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigating Macromolecules and their Properties

Extracts from this document...

Introduction

12/16/2008 Raza, Ismael, Niyaz, Minhal and Rashiv "Investigating Macromolecules and their Properties" Introduction: Background: There are many nutrients that are present in an organism that provides it energy in order to grow and reproduce. Some nutrients are required in larger amounts compared to others. These nutrients, that are required in larger amounts, are known as macromolecules. Identifying and distinguishing these macromolecules can be beneficial to scientists. Knowing these macromolecules and how they are shaped can help scientists and doctors create healthy diet systems, and discover many diseases that are caused by their deficiencies. With advanced technologies, scientists are constantly trying to develop new ways to identify these molecules. Macromolecules are made up of large and complex organic molecules. They are grouped in four different categories. These are carbohydrates, lipids, proteins, and nucleic acids. In this investigation, we will identify different macromolecules and their properties. Problem: Identify and determine the different types of solutions (sugar, protein, starch, and triglyceride) and their properties. Hypothesis: The Biuret reagent (KNaC4H4O6�4H2O) is made up of potassium hydroxide (KOH) and copper (II) sulfate (CuSO4). This blue reagent turns violet in the presence of proteins, and turns pink when combined with short-chain polypeptides (which are simplest form of proteins). ...read more.

Middle

The substance that would be absorbed the most by the brown paper, and would allow the most amount of light to pass through, would be the lipid. Note: some substances might give a positive result for more than one test. In this case, we would use our knowledge to distinguish between them. Material required: > Lab aprons > Safety goggles > 15-100ml calibrated test tubes (or 5 but wash it thoroughly) > 100ml of solution 1 > 100ml of solution 2 > 100ml of solution 3 > 100ml of solution 4 > 100ml of distilled water > Biuret Reagent > Iodine solution > Benedict's solution > Test tube holders > Test tube tongs > Eye droppers > Graduated cylinders > Tape and a marker for labeling > Hot water bath apparatus - heating plate, water, and a beaker > Five 4 * 4 inch brown papers Procedure: 1. Clean all the test tube, graduated cylinders, eye droppers and funnels before starting the experiment. 2. Mark the four unknown solutions as solution#1, solution#2, solution#3, and solution#4. 3. Add water as the fifth solution to keep it as a controlled variable. ...read more.

Conclusion

But when Solution # 1 and 2 were compared, we realized that Solution # 2 was the most transparent and we could easily see the light through it. So we can say that Solution # 2 was triglyceride (it is made up of lipids). Solution # 1 was starch Solution # 2 was triglyceride Solution # 3 was sugar Solution # 4 was protein Discussion: Although we had the fixed amount of compounds in the procedure, we didn't use that amount because of time deficiency. The amount was estimated for the compounds but we measured the amount of reagent added. Due to the lack of the time and the inefficiency of the amount added, we could have made small mistakes, but when the results were compared with the hypothesis, they were all correct. The sizes of the test tubes were not the same. Even though we mentioned this as our controlled variable, we did not keep it controlled in the experiment. This was due to the materials that we were provided with. Also the test tubes we were provided with contained soap contamination which might have caused an error in our results. Sources http://en.wikipedia.org/wiki/Benedict%27s_reagent http://www.madsci.org/posts/archives/2004-12/1102321490.Gb.r.html http://www.geocities.com/auburngirl71/macromolecules.htm http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20101/Bio%20101%20Laboratory/Chemical%20Composition%20of%20Cells/Chemical%20Composition%20of%20Cells.htm ?? ?? ?? ?? Biology | Investigating Macromolecules and their Properties 2 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Ecology Open Investigation Does the geographic location affect the biotic and abiotic ...

    18 Mile Swamp is in a close range to the mean value. In Graph 1.3, shockingly, the data of 18 Mile Swamp were all the same hence the standard deviation value was nil. However for Brown Lake, the graph shows that the data varied noticeably in relation to the mean value.

  2. Biology - Observing the Process of Guttation

    Reason: The even distribution of light is important as light is a major factor of plant growth and should therefore be controlled. o Time * observed at the same time and for the same duration * watered at relatively the same time Reason: Watering the plants at different times of

  1. Penicillin - its discovery, properties and uses.

    1940s, afterwards, they remain the most important group of antibiotics even though many other antibiotics produced and new penicillin derivative continues to be developed. Penicillin binds to the cell wall of bacteria5. Bacteria are single cell organisms, which can be rod-shaped or spherical.

  2. Experiment Colours of Light (Wavelength) absorbed by green plant

    Graph 3 shows the combination of both percentage of absorption against wavelengths for both samples; spinach and mustard. Based on the diagram, it can be deduced that the peak for the top and bottom of the graphs are nearly the same for both samples.

  1. Protein Digestion Design Lab. To detect the amount of protein molecules or short ...

    To detect the amount of protein molecules or short polypeptide chains in the cooked egg white for this experiment, the biuret reagent will be used. The biuret test is a chemical test used for detecting the presence of peptide bonds.

  2. DNA; Past, Present, and Future

    Using this work, Har Govind Khorana, Robert W. Holley, and Marshall Nirenburg deciphered the genetic code. To sum it up, Crick and Watson's work was the final catalyst which represented the birth of molecular biology, and introduced versatile and useful usages of DNA.

  1. FOOD LAB Purpose: To test food and beverages to find its chemical properties

    (high pH - basic, low pH - acidic) Biuret Test - Mix 2-3mL of the unknown solution with an equal amount of sodium hydroxide. Then add, drop by drop, a 0.5% copper sulfate solution. Use a stirring rod to swirl the contents of the tube gently between drop.

  2. Identification of Carbohydrates ,Lipids,and Proteins lab

    Materials Investigation 2 Investigation 3 Investigation 4 MATERIALS Peanuts Butter Beef fat* Lean meat Lard Vegetable Oil Skim milk Whole milk Distilled water Isopropanol (propanol)** Sudan IV MATERIALS 10% egg albumin 1% gelatin Milk Chicken bouillon Distilled Water 0.02 mol/L CuSO4 MATERIALS 1% Glucose 1% Fructose 1% Maltose 1% Sucrose

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work