There are five primary shapes of bacteria found in nature: coccus, spirillum, vibria, bacillus and spirachaetes. These shapes can be found in a variety of configurations that help identify the bacterial species.Know More
Bacteria are single cell organisms found all over Earth, and they group together in colonies. It is estimated that the number of bacterial cells inside the human body is 10 times greater than that of human cells. Most of these bacteria are located in the intestines and colon, where they break down carbohydrates and aid in the absorption and digestion of nutrients. Though these bacteria are not usually harmful to humans, they are capable of acting as opportunistic pathogens during times of compromised immune function. Most bacteria living in the human gut are anaerobes, which means that they thrive in environments that do not offer access to oxygen.
In order to reproduce, bacteria go through a process called binary fission, in which a single cell divides into two identical daughter cells. This process replicates the DNA of bacteria, and in certain species, can occur as frequently as every 20 minutes. The capacity for such rapid reproduction is the reason humans become ill so quickly when infected with an opportunistic bacterial pathogen.Learn more about Biology
Structural proteins are fibrous proteins, and they are the most abundant proteins found in nature. Collagens, fibronectins and laminins are all different types of structural proteins that are used in cell culture applications as attachment factors.Full Answer >
Humans cannot see, smell, or taste individual micro-organisms such as bacteria, protozoa and certain fungi and algae. Such living organisms are microscopic and too small to be seen without magnification instruments (they were first observed by Anton van Leeuwenhoek in 1675).Full Answer >
The glycocalyx serves a variety of functions, from allowing bacteria to adhere to objects to keeping the cornea moist. Glycocalyx is the general name for a gel-like coating that covers the outside of certain cells. The coating is made up of carbohydrates and fibrous proteins.Full Answer >
Unlike bacteria, archaea are able to live in extreme environments, some produce methane, their plasmid membranes are unique compared to other lifeforms and their cell walls lack peptidoglycan, which is present in bacteria cell walls. There are three main forms of archaea: thermophiles, halophiles and methanogens.Full Answer >