Really loved this course and found it really fascinating. Visit the course. Yes the level was a 16 May, Yes the level was a right and I really love it. This introductory level course w Glyn Barrett and all the other professors at the University of Reading who have been a It was a good introduction 26 Jun, This course was a really 29 Aug, In addition, the small quizzes in the course aided I liked the title as it helped m I have learned quite a lot from this course as someone who is new An excellent introduction to mir The course consists of Microbes are organisms that are too small to be seen with the unaided eye.
They evolved long before the first plants and animals appeared and affect our lives in more ways than we might expect. Want to keep learning? This content is taken from University of Reading online course,.
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This article is from the online course:. Join Now. The National Academies. How Infection Works Types of Microbes The microorganisms, or microbes, that can cause disease come in different forms. Viruses Viruses Viruses are unable to reproduce until they invade and commandeer living cells. Influenza, measles, and the common cold are just some of the diseases caused by viruses. What is a virus and how is it different from other microbes? Bacteria Bacteria Bacteria come in three shapes: spherical, rodlike, and curved.
Bacteria are single-celled organisms that have been around for billions of years. Discover their important characteristics. They also have different means of nutrition, which groups them as autotrophs or heterotrophs. Algae, also called cyanobacteria or blue-green algae, are unicellular or multicellular eukaryotes that obtain nourishment by photosynthesis. They live in water, damp soil, and rocks and produce oxygen and carbohydrates used by other organisms. It is believed that cyanobacteria are the origins of green land plants.
Although viruses are classified as microorganisms, they are not considered living organisms. Viruses cannot reproduce outside a host cell and cannot metabolize on their own. Viruses often infest prokaryotic and eukaryotic cells causing diseases. A group of eukaryotic organisms consisting of the flatworms and roundworms, which are collectively referred to as the helminths. Although they are not microorganisms by definition, since they are large enough to be easily seen with the naked eye, they live a part of their life cycle in microscopic form.
Since the parasitic helminths are of clinical importance, they are often discussed along with the other groups of microbes. Learning Objectives Define the differences between microbial organisms. Key Points Microorganisms are divided into seven types: bacteria, archaea, protozoa, algae, fungi, viruses, and multicellular animal parasites helminths. Each type has a characteristic cellular composition, morphology, mean of locomotion, and reproduction. Microorganisms are beneficial in producing oxygen, decomposing organic material, providing nutrients for plants, and maintaining human health, but some can be pathogenic and cause diseases in plants and humans.
Key Terms Gram stain : A method of differentiating bacterial species into two large groups Gram-positive and Gram-negative. Bacteria Bacteria are unicellular organisms. Archaea Archaea or Archaebacteria differ from true bacteria in their cell wall structure and lack peptidoglycans.
Fungi Fungi mushroom, molds, and yeasts are eukaryotic cells with a true nucleus.
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