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Lab 4 Notes

by: Chelsea Barksdale

Lab 4 Notes BSC1005L

Chelsea Barksdale

GPA 3.0

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About this Document

These notes are in conjunction with the Lab 4 questions
Biological Foundations Lab
David WIngfield
Class Notes
Biology, chemical, composition, cells
25 ?




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This 2 page Class Notes was uploaded by Chelsea Barksdale on Thursday October 13, 2016. The Class Notes belongs to BSC1005L at Hillsborough Community College taught by David WIngfield in Fall 2016. Since its upload, it has received 5 views. For similar materials see Biological Foundations Lab in Biology at Hillsborough Community College.


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Date Created: 10/13/16
Cells are composed of proteins, carbohydrates and lipids, these important molecules are needed for growth and repair. They are the building blocks of cells Proteins are built from amino acids Carbohydrates are chains of sugar A polymer is a large molecule, or macromolecule, composed of many repeated subunits. Because of their broad range of properties, both synthetic and natural polymers play an essential and ubiquitous role in everyday life. The linking of amino acids builds the macromolecule: proteins and polypeptides Sugars are building blocks of polysaccharides such as glycogen. Polysaccharides such as starch and cellulose are also composed of the subunit. Lipids are characterized on the basis of their insolubility in water Proteins are composed of monomeric building blocks called amino acids Lipids are insoluble in water Proteins are a diverse group of molecules Proteins have many important functions in a cell The Biuret reagent is best suited for the detection of protein Iodine is used to detect the presence of starch A test tube purple in color is a positive reaction for the presence of reducing sugars using Benedict’s test Albumin and pepsin have a purple color after the addition of the Biuret reagent Carbohydrate service Fuel and energy storage molecules Carbohydrates also serve as structural molecules in some organisms Starch is a polysaccharide Proteins that speed up chemical reactions are called enzymes Amylase is an enzyme that catalyzes the breakdown of starch into sugar A positive reaction to the iodine test for starch is indicated by a dark color In the test for sugars experiment Benedict’s reagent is used to detect the presence of glucose A positive result for the Benedict’s test for the presence of reducing sugars is brown A long chain carbohydrates such as starch that is composed of hundreds to thousands of glucose molecules is called a polysaccharide What is a polymer of thousands of glucose molecules In the starch composition experiment the enzyme pancreatic amylase was used to hydrolyze starch into glucose Starch is a polymer of thousands of glucose molecules Amylase digest starch into glucose Emulsifier is a compound that causes oil to disperse in water Adipose tissue is located beneath the skin and serves as a major location for the storage of fat Proteins are diverse molecules with many functions proteins that speed up reactions are called the end but this is not all that many proteins are involved in cell signaling functioning in the immune system and may also be used to build parts of the cell so it can be structural


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