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BLG 151 - Chapter 1 - Microbial Life.docx

BLG 151 - Chapter 1 - Microbial Life.docx - Chapter 1 1.1...

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Chapter 1 Microbial Life: Origin and Discovery 1.1 What Is a Microbe? A microbe is defined as a living organism that requires a microscope to be seen o This definition does not hold true for all microbes, i.e., 1) algae can be seen with the naked eye 2) viruses are not considered to be alive & 3) mushrooms are multicellular Microbes are divided into two categories: cellular and acellular microbes o Cellular (living) microbes : Fungi, Protists, Bacteria and Archaea o Acellular (non living) microbes : Viruses (made up of protein and nucleic acid), viroids (made up of RNA), statellites (made up of nucleic acid and RNA), and prions (made up of proteins) Eukaryotic cells – have a well-defined membrane-bound nucleus (containing chromosomal DNA) and organelles. Prokaryotic cells lacks a membrane-bound nucleus, mitochondria, or any other membrane-bound organelle . 1.2 We Study Microbes Because… Microbes are the most numerous and diverse group of organisms and they are ubiquitous , meaning they are found everywhere Microbes play a major role in recycling essential elements. (i.e., Carbon) Microbes are a source of nutrients and some carry out photosynthesis Few microbes cause disease in plants and animals; “germs”. But, most benefit society by their production of: food, beverage, antibiotics, and vitamins Gene regulation discovered in bacteria provided models for animals and plants 1.3 Culturing Media Three physical forms of culture media are used 1. Liquid or broth Media
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