Prokaryotes - PowerPoint PPT Presentation

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Prokaryotes

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  1. Prokaryotes -20.2

  2. Prokaryotes • Unicellular organisms that decompose • DNA not membrane bound and is located in cytoplasm • Produce food • Has a quick metabolism in order for decomposing purposes

  3. Prokaryote Structure and Function • Prokaryotes vary in: • Shape, means of locomotion • Pigments, colony appearance, and staining • Nutrient requirements, metabolism • Genetics: DNA properties

  4. Size, Shape, and Movement • Shapes: Bacilli, cocci, spirilla • Bacilli: Rod-like Usually found alone • Cocci: Spherical Usually arranged in pairs • Spirilla: Spiral shaped Varies in size dramatically

  5. Energy Used by Prokaryotes: Nutrition & Metabolism • Heterotroph: take in nutrients • Photoheterotroph: depends on light for most of its energy and principally on organic compounds for its carbon. • Photoautotroph: Uses energy from sun and converts it into food through photosynthesis. • Chemoautotroph: use energy released by chemical reactions to make food

  6. Energy Released by Prokaryotes

  7. Growth and Reproduction in Prokaryotes • Reproduce by binary fission • When growth conditions are scarce, prokaryotic cells form a thick, internal wall that encloses the DNA

  8. Recombination in Prokaryotes • Mutations: cause prokaryotes to evolve • Conjugation: The formation or existence of a link or connection between things, in particular.

  9. Importance of Prokaryotes • Decomposers • Producers • metabolism • Food production