9 How could you tell if a solution consists of protein starc

9). How could you tell if a solution consists of protein, starch or lipid? Remember to study the specific test for each macromolecule. Name the monomers of each macromolecules and types of bond found between each macromolecules.

I have a biology lab exam coming up this is one of the review topic questions. I would appreciate the help. Also, please type out the response I cannot read handwritten responses. Thanks

Solution

Monomer of starch is glucose which is joined in 1,4 linkages.

Take small quantity of the sample to be tested on a glass slide. Dilute it with two drops of water, put 2-3 drops of iodine solution on it., Observe the colour of the sample.Change of color into blue-black indicates the presence of starch in the sample.

Monomer of protein is aminoacid which is joined by peptide bond

Take a small quantity sample in a test tube (10-15 drops), add two drops of copper sulphate solution to the same test tube, add 10 drops of caustic soda solution and shake the same test tube. Observe the colour of the mixture. Violet color indicates the presence of proteins in the tested food item.

mononer of fat is fatty acids and glycerol bound mainly through ester linkage

.Put some drops of the solution in a paper and keep the paper for drying and observe the paper if an oily patch on the paper occurs it indicates the presence of fat in the tested sample..