Abstract This lab was done to test for macromolecules consisting of carbohydrates, lipids, proteins, and nucleic acids by using specific reagents to test for each.
Carbohydrates Carbohydrates are better known to students as sugars and starches. Monosaccharides or simple sugars such as glucose and fructose C6H12O6 function as energy source in cells during cellular respiration and are also used to build cell structures and other organic molecules within the cells.
Disaccharides are composed of two monosaccharides joined together. Sucrose table sugar is a disacharide composed of one glucose and one fructose molecule. Are long chains of monosaccharides bond together. Plants store excess glucose in the form of starch, a polysaccharide composed of long chains of glucose.
Starches can be found in potatoes, rice, wheat, corn, bananas, peas, beans, lentils, and other tubers, seeds and fruits of plants.
Animals and humans store excess glucose in the form of glycogen in the liver and muscles. Between meals the liver breaks down glycogen to glucose and releases it into the blood stream to supply glucose to cells in need. Other important polysaccharides are cellulose and chitin.
Cellulose makes up the cell wall of plants whereas chitin provides structure to fungi and the exoskeleton of arthropods. Lipids A lot of lipids function as long-term energy storage.
One gram of fat stores more than twice as much energy as one gram of carbohydrates. Lipids are also an important component of the cell membrane. Lipids consist of glycerol and fatty acids "tails". The fatty acid chains can be saturated, with all carbons saturated with hydrogen atoms forming a straight chain without double bonds.
Unsaturated fatty acids contain double bonds within the carbon chain, which results in a bend of the chain. Proteins Proteins are complex, specialized molecules composed of carbon, oxygen, hydrogen, nitrogen and sometimes sulfur. The building blocks of proteins are amino acids. There are 20 different amino acids that combine to form polypeptides proteins.
The different amino acids are similar in structure: The different amino acids have different side chain, but are otherwise identical. Proteins have many important roles in organisms. Structural proteins such as collagen or elastin, provide support.
Regulatory proteins such as enzymes control cell processes. Proteins also play an important part in the immune system antibodiesoxygen transport hemoglobinmovement muscles etc.
Nucleic Acids Nucleic acids are composed of building blocks called nucleotides.
Each nucleotide is made of a sugar molecule, a phosphate molecule and a nitrogenous base. In DNA deoxyribose nucleic acid the sugar is a deoxyribose and the nitrogenous bases are adenine, guanine, cytosine and thymine.Detecting compounds made by living things To determine the presence and absence of starch, sugar, protein and fat in various food samples.
Procedure Refer to lab manual.: A. Tests For Carbohydrate (c) Test for sucrose Yes, a color change between the two test tubes is visible.5/5(2). An analysis of president clintons state of the union address Europe An analysis of the important concept of cultural relativism UK a lab analysis of starch and fat molecules an analysis of the drugs on the internet suppliers of BioBran MGN-3 arabinoxylan (Bio Bran), an analysis of the theory of relativity by albert einstein Premier an analysis of the origins of the vietnam war Research Labs a.
Aug 02, · The third lab for carbohydrates consisted of cleaning four test tubes and labeling them 1 through 4. Each test tube was filled with 10 drops respectively of distilled water, glucose solution, sucrose solution, and starch solution. Three drops of iodine were added to each tube and swirled.
The color results were recorded in table 3. Aug 02, · Bio Biological Molecules of Life Lab Report. Biological Molecules of Life.
Jessica Leonard. Biology Lab. April 5, Abstract. This lab was done to test for macromolecules consisting of carbohydrates, lipids, proteins, and nucleic acids by using specific reagents to test for each.
Biology 13A Lab Manual 5Lab #13 Nutrition and Digestion complex large molecules such as proteins and carbohydrates to their basic components (e.g.
amino acids and simple sugars).
Starch and glycogen are polysaccharides. They are major sources of energy for cellular work. Common. 5 All Tubes: 3) Add 2 ml of Benedict’s reagent to each tube.
4) Gently shake each tube to mix the solution. 5) Heat the test tubes for 3 minutes at °C (boiling water) in a beaker of water on your hotplate.