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.Know More
All bacteria have a glycocalyx, but glycocalyx coatings are also found in certain animal cells. In some bacteria, the glycocalyx may form a tightly bound outer covering called the capsule. The capsule protects the bacterial cell from being consumed by other cells because it covers up molecules used to grab the bacteria and pull it inside an attacking cell. The capsule also makes the bacterial cell sticky, so it can adhere to objects and to other cells. This helps the bacteria form colonies and resist being flushed away by currents.
Animal cells, unlike bacterial cells, do not always have a glycocalyx. In humans, cells with notable glycocalyx coatings are found in certain tissues doing various kinds of work. Within the eye, glycocalyx proteins near the cornea draw water in and keep the cornea moist. This protects the cornea from infection and from exposure to air.
The inner lining of human blood vessels also contains glycocalyx-producing cells. Here, the glycocalyx serves as an interface between blood and blood vessel, regulating the passage of hormones and nutrients to and from organs. It also modulates the number of red blood cells passing through capillaries. Finally, throughout the body, the glycocalyx is used to identify cells as the body's own and to facilitate communication between cells in the same tissue.Learn more in Biology
A taxonomic key is a method used to classify and identify objects and organisms. It shows a series of choices about the characteristics of different organisms. A user picks from these choices and ultimately finds the identity of a specimen.Full Answer >
Non-motile bacteria are bacteria that show no motion. They lack the ability to swim toward optimal areas for survival, and they don't swim away from toxicity or toward nutrients and optimal light concentrations. This purposeful, spontaneous form of movement that most bacteria engage in is nonexistent in this form of bacteria.Full Answer >
Ultraviolet radiation emitted by UV light bulbs inactivates bacteria by inhibiting DNA replication when the bacteria absorbs the light. The damaged DNA cannot repair itself, causing it to die.Full Answer >
Four examples of organisms classified under the Kingdom Monera are bacteria, mycoplasms, cyanobacteria, and archae bacteria. Organisms that meet the qualifications of the kingdom Monera are called Monerans.Full Answer >