The Use Of Positive And Negative Controls To Determine The Macromolecules Present In An Unknown Solution

unravel # 6130, Wednesday, 7-10 PM, B2-151 Lab performed: September 21st, 2011 Introduction E precise living thing is dependent on large thickening molecules, cognize as macromolecules. The objective of this research seeking groundoratory was to justly notice which macromolecules the unknown solution was comprised of using diverse substances as experimental withstands. There are four major types of biological macromolecules - carbohydrates, lipids, proteins, and nucleic acids - made up of elements such as carbon, hydrogen, oxygen, nitrogen, sulfur, and match in various combinations. Macromolecules are essential for survival; they show morphologic support, a source of stored fuel, the ability to store and obtain transmissible information, as well as the ability to further up biochemical reactions; hence their importance in biological systems is notable. (Prakash, 2008). The control samples have a known outcome; in this lab bo th incontrovertible and disallow controls were used to determine the identity operator of the unknown solution. The macromolecules being well-tried in this lab were carbohydrates (monosaccharides and polysaccharides) and proteins.

To identify the figurehead of these macromolecules in a substance, three different alkali races were performed. Lugols iodine solution was used for acknowledgment of starch and glycogen - polysaccharides - in the twelve solutions. A positive outcome of the test results in a colour reposition; naughty-black in the presence of starch and a red-brown in the presence of glycogen. A neg ative outcome results in no colour channel ! and all solutions remain a very pale chicken (Pavia, 2005). Benedicts solution was used to identify the presence of reducing sugars; the aldehyde operating(a) group is the part that reacts in the test. A positive power of the test is the formation of a benighted precipitate of the blue solution, ranging from yellow-green to red-brown (Hequet and Abidi, 2006). Lastly, the Biuret solution was used to test for the presence of... If you expect to get a full essay, sound out it on our website: BestEssayCheap.com

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