PRE LAB

Emilio Lajara
Pre-Lab Write Up
Chapter Three
02-05-08


Objective-
Proteins atomic number 18 made up of aminic acids. All amino acids ar found in cells. They retain an acidic group and an amino group. A peptide is when one or more amino acids course a chain, while a polypeptide is a long chain of amino acids. A protein house contain one or more polypeptide chains.
Carbohydrates have sugars and molecules that form chains of sugars. Glucose is a single sugar unit, while maltose has two sugar units. Glucose is used by on the whole organisms to insert energy. Energy is released when glucose is broken down into carbon dioxide and irrigate.
Lipids are compounds that are insoluble in water and soluble in solvents. Lipids acknowledge fats, oils, phospholipids, steroids, and cholesterol.

Materials-
Protein-The materials used in protein were ravel tubes, distilled water, albuminun, pepsin, starch, and biuret reagent.
Carbohydrates- The materials used in carbohydrates were test tubes, water, starch, suspension, onion juice, potato juice, glucose solutions, and iodine (IKI).
Lipids- The materials used in this portion were Water, piece of brown paper al-Qaida, and vegetable oil.

Procedures-
Protein-In this experiment we are interrogation for protein in each solution. We pour dribbles of biuret reagent into the different contents.



If the liquified turns purple, then protein is active.
Carbohydrates- In this experiment We test for starch. We pour drops of iodine onto the different liquids. If starch is present the liquid is to turn a blue/black color.
Lipids- In this experiment we are testing for lipids. We pour a drop or two of water onto one piece of paper bag and another drop of oil onto a different piece of paper bag. after a couple of minutes we identify for lipids. If the paper bag leaves an oily spot then lipids is active.

Expected Results-
The hypothesis of all experiments were true. Protein is in fact active when the liquid turns purple due to biuret reagent. Starch is active when the...If you want to get a adequate essay, order it on our website: Orderessay



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