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Protists

Protists. Do Now: 1. Please complete the following chart 2. When finished, find the mass of dry soil from the plant lab. Bioenergetics Connection. Unit 2 is about bioenergetics and covers the following: Photosynthesis Respiration

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Protists

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  1. Protists Do Now: 1. Please complete the following chart 2. When finished, find the mass of dry soil from the plant lab.

  2. Bioenergetics Connection • Unit 2 is about bioenergetics and covers the following: • Photosynthesis • Respiration • Protists (Earliest eukaryotes with chloroplasts & mitochondria) • Human energy use & issues

  3. Quick Review of Key Points • Photosynthesis • Formula: • Chloroplasts • Respiration • Reverse of photosynthesis • Mitochondria

  4. Part 3, Protists • Oxygenation of the atmosphere by photosynthesis 2.5 – 2.0 BYA allows aerobic respiration • Organisms diversify and become more complex • Eukaryotes evolve through endosymbiosis of chloroplasts and mitochondria

  5. Protist Groups • These groups are convenient classifications, not phylogenetic ones.

  6. Algae • Contain chloroplasts & other plastids; do photosynthesis. • Also contain mitochondria; do aerobic respiration • Most are unicellular, some are colonial or even multicellular. • Contains tens of thousands of species, in several groups.

  7. Protozoa • “proto” = first, “zoa” = animal • Think of the protists as unicellular animals. • They are heterotrophs, and almost all are predators on prokaryotes or smaller eukaryotes. • For convenience, they are classified by locomotion.

  8. Flagellates • Characterized by 1 or more flagella

  9. Example: Trypanosoma • Causes African sleeping sickness

  10. Cilliates • Move by beating tiny cilia • Example: paramecium

  11. Amoeboids • Move with pseudopodia in a blob-like manner • Pseudo = false; podia = feet • Example: Amoeba proteus

  12. Sporozoa – “Spore Animals” • No motility (except for some gametes) • Obligate pathogens • Example: Plasmodium (causes malaria)

  13. Four Groups of Protozoa

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