Jennifer Stearns

The way that DNA encodes the instructions for proteins is through a set of four molecules called bases, each of which represents a letter of the genetic code (A = adenine, C = cytosine, G = guanine, and T = thymine). The bases are made of carbon and nitrogen rings and are bound to a sugar and a phosphate to form a nucleotideThe nucleotides are connected together to form a long chain with the bases pointing out.

When you're studying microbiology, you need to know the key differences between the three domains of life, how scientists name and classify organisms, and how scientists identify microorganisms.Differences among bacteria, archaea, and eukaryotic microorganismsThere are three domains of life: bacteria (also known as eubacteria), archaea, and eukarya.

Prokaryotic cells come in many different shapes and sizes that you can see under a microscope. A description of the shape of a cell is called the cell morphology. The most common cell morphologies are cocci (spherical) and bacilli (rods).Coccibacillus are a mix of both, while vibrio are shaped like a comma, spirilla are shaped like a helix (a spiral, sort of like a stretched-out Slinky), and spirochetes are twisted like a screw.

There are three domains of life: Bacteria (also known as Eubacteria), Archaea, and Eukarya. The Bacteria and Archaea are made up entirely of microorganisms; the Eukarya contains plants, animals, and microorganisms such as fungi and protists. The Bacteria and Archaea have been grouped together and called Prokaryotes because of their lack of a nucleus, but the Archaea are more closely related to the Eukaryotes than to the Bacteria.

Since the 19th century, there has been an explosion of great microbiological research, leading to many different branches of microbiology, all of which are both basic and applied in nature. Here’s a list of the different fields of microbiology that have developed since the discovery of microorganisms: Aquatic, soil, and agricultural microbiology study the microorganisms associated with aquatic (including wastewater treatment systems), soil, and agricultural environments, respectively.

Perhaps one of the most frightening and nastiest of the microbes may be the ones people don’t know about and can’t prepare for. Organizations like the World Health Organization and the U.S. Centers for Disease Control are constantly on the alert for new emerging pathogens, yet these pathogens can still appear without warning.

Catabolism (the breakdown of compounds for energy conservation) can happen in different ways for different types of microorganisms. In chemoorganotrophs (organisms that derive their energy from organic compounds), there are two forms of catabolic metabolism: fermentation and respiration. Fermentation is a form of anaerobic catabolism (in the absence of O2) where the organic substrate acts as both the electron donor and the electron acceptor.

Microbiology involves studying microorganisms from many different angles. Each perspective uses a different set of tools, from an ever-improving and changing toolbox. These include the following: Morphology: The study of the shape of cells. It is analyzed using stains and microscopy. Metabolism: How an organism gets energy from its environment and the waste it produces as a result.