Flagellum

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    Direct Motion Lab Report

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    Goals E. coli is a type of bacteria that sense and swim towards sugar, amino acids, pyrimidines and electron acceptors. Thus, the goal of this experiment was to determine whether E. coli has a direct motion or random motion when a chemoattractant (glucose) was present. This was done by observing the velocity before and after the chemoattractant and by making Log-Log Plot. Theoretical Chemotaxis refers to the ability of organisms to move in response to the presence of a chemical. The movement of organisms could be either attractant in the same direction as chemoattractants , or it can repel the chemoattractant. Direct motion is defined when an organism move with regard to a reference point in a followed pathway. However, bacteria might also move randomly as a result of their collision with other fast moving particles in various environments. When there is a gradient present, E. coli moves to the chemical emitted from the chemoattractant. The attracted chemical binds to the chemoreceptors known as methyl-accepting chemotaxis proteins in the cell membrane of E. coli. E. coli compares recent and previous concentrations over periods of time. The methyl-accepting chemotaxis protein receptors in E. coli uses cytoplasmic signaling proteins to control flagellar rotation and sensory adaptation. Since E.coli monitores their environmental concentration gradient, we hypothesized that E. coli moves in a favorable direction toward glucose chemoattractant. As a result, we expected…

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    Pathogenesis Of Bacteria

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    The role of this structure in the pathogenesis of the bacteria is of high medical importance as it helps the bacteria to be propelled or display from one location to another carrying the infection to other areas fast, an example is the Escheria Coli, which can propel from the urethra to the bladder, known as the most common causes of urinary tract infection (UTI’s), and some other as flagellum cannot be seen under microscope without stain, helps to differentiate them using specific antibodies…

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    Similar traits, bone structures, and chromosomes are some of the most known pieces of evidence to support the theory of evolution. The main evidence that intelligent design can provide is how the bacterial flagellum is ordered perfectly to be able to function. Supporters of intelligent design say that the structure is so perfectly made that it cannot be evolved and it is designed. It has been said that, in the case of the bacterial flagellum, there are similar structures that could have led the…

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    DISCUSSION Spermatozoa and its Arrival to the Egg Before embarking in the complexity of CatSper channels, the particular characteristics of sperm and its movement towards the egg in female that allows for fertilization should be addressed. Spermatozoa are differentiated motile cells that have two main structures: the head, which houses packed DNA, and the flagellum, the motility portion that transports the sperm genetic information to the egg (1). Within the spermatozoa head both a vesicle…

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    The article "Sleeping Sickness Parasite has a weak spot in its tail” by Catherine Brahic, is a very brief summary about a parasite,Trypanosoma brucei, passed to humans from the tsetse fly. The sleeping sickness is responsible for 50,000 deaths a year in Africa. Brahic states that they have discovered that the parasite cannot reproduce if its whip-like tail or "flagellum" stops working. Although they are still unsure, as to why the flagellum exists. Keith Gull of Oxford University has a theory,…

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    The repetitive motion of the flagellum can be seen most commonly and recognisably in sperm cells this motion along the length of the flagella causes the motion through the fluid. Both cilia and flagella rely on accessory proteins, some hold the structure together and others cause them the bend which is vital for their function. The accessory protein that is crucial for this bending movement is dynein this is attached to one microtubule by its tail and its head attaches to a parallel microtubule…

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    Centriole Research Paper

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    is key in almost every cell. Also with the mesosome being pushed together, it is possible that it can be a vesicle, where materials in the cell can be withheld away from the rest of the cell. http://www.ivyroses.com/Biology/Cells/Prokaryotic-Cell-Structure.php http://www.enotes.com/homework-help/what-mesosomes-how-they-work-47929 Flagellum (B) Their structure is made of microtubules where there are nine pairs of microtubules that can be found within the core. Protein tubulin is what the…

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    I also knew because it was green and has a distinguishable feel. It feels kind of crusty and is very fragile. Bacteria 1.) Flesh-Eating Bacteria-I knew that this was bacteria because it was the rod-shape like bacteria. It also had pili and a flagellum. It has all the parts that are needed for a regular bacteria cell meaning that it is bacteria. [Plus, it’s got it in its name ;)] 2.) Salmonella-I knew this was Salmonella because it was rod-shaped gram-negative bacteria. Gram-negative…

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    Eukaryotes

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    Both prokaryote and eukaryote contains DNA. DNA is what controls the behavior and actions of the cells. Ribosomes also known as protein is a similarity that both eukaryotes and prokaryotes share. They both have a cell wall also. In difference, eukaryotes contain mitochondria, which creates energy from taking nutrients and breaking them down, a nucleus, which contains the genetic material of the cell, and chloroplasts, which convert light energy to sugar. Prokaryotes have a bacterial flagellum,…

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    Intelligent Design Theory

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    claims that such changes would be unnecessary and maybe even hinder the structure of the mousetrap. “An irreducibly complex system has no function whatsoever until all the parts are in place. If you were to take one part away from the mousetrap it would no longer function” (Behe, 1999). Bacterial flagellum, a microstructure which attaches itself to the tail ends of some bacteria; is also, according to design theorists, another example of irreducible complexity. The flagellum attaches itself to…

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