Bio-110-Lab07 - Bio-110 Lab 7 Bio-110 Laboratory Exercise...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Bio-110 Lab 7 1 Bio-110 Laboratory Exercise #7 - Biochemical Tests for Biological Molecules 1. Carbohydrates A carbohydrate is a simple sugar or a larger molecule composed of multiple sugar units. Those composed of a single sugar molecule are called monosaccharides such as ribose, deoxyribose, fructose, or glucose. Monosaccharides are easily used within cells as energy sources. If two monosaccharides are bonded together, they form a disaccharide such as sucrose, maltose, or lactose. If more than two monosaccharides are bonded together, the resulting large carbohydrate molecule is called a polysaccharide. Animals, including humans, store glucose in the form of glycogen, a highly branched polysaccharide composed of glucose molecules. Starch synthesized by plants is an important food molecule for humans. Starch is also composed of glucose monomers but not as highly branched as glycogen. Many small carbohydrate molecules (reducing sugars) react upon heating with a copper-containing compound called Benedict’s reagent, changing the reagent color from blue to yellow, orange, or red. A disaccharide may or may not react with Benedict’s reagent, depending how the bonding of the component monosaccharides took place. Other tests are available for some polysaccharides, the most common of which is Lugol’s test for starch. In this test, a dilute solution of potassium iodide reacts with the starch molecule to form a deep blue (nearly black) color product. 2. Proteins Proteins are a diverse group of biological molecules with a wide range of functions in the human body. Many are structural components of muscle, bone, hair, fingernails,
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Bio-110 Lab 7 2 and toenails, among other tissues. Others are enzymes that speed up cellular reactions
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/01/2010 for the course BIO 110 taught by Professor Drazkiewicz during the Fall '09 term at San Mateo Colleges.

Page1 / 8

Bio-110-Lab07 - Bio-110 Lab 7 Bio-110 Laboratory Exercise...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online