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This is the fourth and final part of the series on Life’s Biomolecules. This article will discuss nucleic acids which are the foundation for gene expression and protein synthesis. This important biomolecule category only contains two members: Deoxyribonucleic Acid (DNA) and Ribonucleic Acid (RNA). Most people have heard these terms, but may not know what they are exactly or how they work.

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This third part of our series will discuss Lipids. This group of biomolecules is a motley crew. It’s comprised of seemingly unrelated compounds with only a single unifying feature: they all hate water. Literally! The lipids are hydrophobic; not in a sense that they have a psychological fear of the wet stuff, but rather they don’t like it and are thus insoluble in it. The members of this lipid group include waxes, sterols, phospholipids and fats. But why the hate? It’s actually a result of their molecular structure. While they may have polar bonds, lipids are essentially made of nonpolar hydrocarbons.

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Isolation and Characterization of Proteins Extracted from Liver, Fish and Egg Whites Discussion and Conclusions.

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Protein Preparation Methodology.

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This second part to our series will cover Proteins. Contrary to popular belief, proteins are not simply "things" found in meats and cheeses. They are more complex than that. They are a vast group of biomolecules that perform a variety of functions in living organisms.

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This four-part series of articles will provide an overview of the molecules of life, which are found in all living organisms: Carbohydrates, Proteins, Lipids, and Nucleic Acids. This is the first of the series.