TAQ1 Definition of Pathogen and research into the main features of bacteria‚ protozoa‚ fungi and viruses. Pathogens‚ or infectious agents‚ are microorganisms that cause disease or illness to their host. There are divided into four groups; bacteria‚ protozoa‚ fungi and viruses. The term pathogen most often describes an organism that disrupts the normal physiology of a plant or animal. In identifying a pathogen it is important to determine the properties that ‘contribute to its infectious
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Introduction There are both virulent and non-virulent bacteria and fungi that grow on plants. It is difficult to distinguish between the two without proper inspection and diagnosis of the diseased plant to know whether the bacteria or the fungus in question is the virulent or non-virulent one. Therefore pure cultures need to be isolated to know with absolute certainty which is the causative bacteria or fungus. Potato dextrose agar is a good nutrient agar for mycelia to thrive on which is present
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and proteins Viriods and prions Viriods: Single stranded circular Rna Prions: only protein Bacteria Living‚ prokaryotes 1 Seven characteristics common to life Cells and organization Energy use Respond to environmental change Regulation and homeostasis Growth and development Reproduction Change over the course of generations 2 Viruses Over 4‚000 different types of viruses Virus have their own genomes‚ but are considered nonliving Must be taken up by a living cell
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What are bacteria? Bacteria are very different from viruses. First of all‚ bacteria are much larger in size. The largest virus is only as big as the very smallest bacterium (singular for bacteria). But bacteria are still microscopic and cannot be seen with the naked eye. They are so small that the sizes of bacteria are measured in micrometers (10‚000 micrometers = 1 centimeter). By comparison‚ the head of a pin is about 1000 micrometers wide. Though more complex than a virus‚ the structure of a
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Bacteria and Viruses Breann Johnson COM/155 03/17/2013 University of Phoenix Bacteria and Viruses Almost 56‚000 people are hospitalized each year‚ and over 1‚300 die because of food borne bacteria and virus microbes. Bacteria and viruses are tiny microscopic pathogens that can cause infectious disease‚ or even result in death. “Infectious diseases remain a major cause of death‚ disability‚ social‚ and economic disorders for millions of people around the world. Poor health
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To differentiate between bacteria‚ fungi and yeast‚ we plant four different microbes in plates under the same environment for one week and compare the growth of the four microbes by macroscopic and microscopic observation. Meanwhile‚ the diversity of bacteria and fungi in humans‚ the environment and wood could be observed. In addition‚ the four substrates are cultured in two media‚ MEA and NA‚ under the same condition. Thus‚ how nutrients affect the growth of bacteria and fungi could be achieved
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It is thought that archaea and bacteria were diverged early in their existence because of all the dissimilarities between the two groups. Both bacteria and archaea are enclosed in cell membranes. Archaea have a single cell membrane that absences a peptidoglycan wall and also their genetic transcription and translation‚ the two main processes in molecular biology do not show the typical bacterial features‚ but are quite similar to those of eukaryotes. Archaea are more related to eukaryotes‚ even though
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a living thing? Are viruses alive or not? To figure out this question we first have to know‚ what defines a living thing. According to the online Merriam-Webster Dictionary‚ life is in particular “an organismic state characterized by capacity for metabolism‚ growth‚ reaction to stimuli‚ and reproduction.” For about 100 years‚ scientists have repeatedly changed their mind over what viruses are. First seen as poisons‚ then as life-forms‚ then biological chemicals‚ viruses today are thought of as
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A fungus (/ˈfʌŋɡəs/; plural: fungi[3] or funguses[4]) is a member of a large group of eukaryoticorganisms that includes microorganisms such as yeasts and molds (British English: moulds)‚ as well as the more familiar mushrooms. These organisms are classified as a kingdom‚ Fungi‚ which is separate from plants‚ animals‚ protists and bacteria. One major difference is that fungal cells have cell walls that contain chitin‚ unlike the cell walls of plants and some protists‚ which contain cellulose‚ and
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According to Cambridge Advanced Learner Dictionary Third Edition‚ parasite is an organism that lives on or in another living organism and feeds from it. Parasites are organism that could affect human body and gain benefits on it and gives human diseases out of it. Parasites cause a lot of major disease to human‚ and animals. Parasites also carries diseases from animals and transmit it to humans.Parasite was first discovered by Charles Louis Alphonse Laveran‚ a military doctor in France’s Service
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