As species of living things change over time, the DNA contained in their cells change, because of evolution. If we can extract the information from living things today, and compare them to each other, we can see which living things are most closely related, the most similar can be thought to be the most closely related in time. Biologists can then construct family trees, or phylogenies. By combining each tree, a grand tree connecting all living things can be made, this is called the "Tree of Life". Bioinformatics uses integration of mathematical, statistical and computational method to analyze biological, biochemical and biophysical data.
All of the information needed by a cell is provided in its DNA. When a cell wants to build a protein, it finds the appropriate piece of DNA, makes a copy of it (called RNA), and uses the instructions in the copy to make the protein.
Proteins can perform many functions like transportation, structural support, movement and metabolism. Proteins are made from amino acids. There are twenty different amino acids that are used to build millions of different protein molecules.
These molecules can be studied using computers to analyze the DNA, RNA, and amino acid sequences from which they are created. Because there are so many different molecules, the best way we have of understanding how the entire system works is to use bioinformatics.
Computers in bioinformaticsEdit
Chemists have developed ways to understand the shape and behavior of small molecules, using [[mathematics|mathematical analysis. They might use computers to study these molecules. The DNA contained in just one cell of an organism is far too large to be read by any person, and to compare the DNA between two (or more) organisms, be they in the brother and sister, or of a completely different species, requires comparing large amounts of information to find differences. Computers are better suited to such comparisons, and computer programmers have worked with biologists to create very very large databases to store all the DNA information that has ever been learned.