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Published byErica Arline Charles Modified over 9 years ago
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Microorganisms & Bacteria Section 1.1-4
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Microorganisms Very small, living things that you need a microscope to see Three kingdoms include microorganisms – Archaea – Bacteria – Protists
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Characteristics of living things Organization (cells) Growth Reproduction Response
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Needs of Living Things Energy Materials Living space
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Viruses Genetic material enclosed in a protein shell Viruses are not living things – Not as complex as a cell – Do not take in energy – Do not grow once formed – Cannot reproduce by themselves H1N1 virus
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Viruses Multiply inside living things (hosts) – Attachment – Injection – Production – Assembly – Release Host is usually damaged or destroyed
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Bacteria Simplest kind of life on Earth – Single celled – Do not contain a nucleus Classified by shape Spiral Rod Round
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Bacteria Producers - make own food – Contain chlorophyll – Perform photosynthesis Decomposers – break down dead or decaying material – Recycles material Parasites – live in or on other organisms
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Bacteria Helpful – Release oxygen into the air – Recycle materials – Clean up sewage and oil – Make materials useful (Nitrogen fixing) Harmful – Cause disease
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Archaea Single-celled organisms that can survive in the largest range of environments. Do not contain a nucleus. – Methanogens – produce natural gas. Can not live in oxygen – Halophiles – live in very salty water – Thermophiles – live in extreme heat or cold
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Protists Organisms with a nucleus that do not belong to animal, plant or fungi kingdom – Most live in water – Most are single-celled – Have simpler structures
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Protists Algae – plant-like protists (photosynthesis) Plankton – organisms that drift (not swim) in water Protozoa – animal-like protists (eat others) Decomposers – absorb food from environment (molds)
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