chapter_28_pdf - Protists Chapter 28 1 Outline...

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1 Protists Chapter 28
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2 2 Outline • Endosymbiosis • Classifying Protists • General Biology of Protists • Six Lineages – Euglenozoa – Alveolata – Stramenopila – Rhodophyta – Chlorophyta – Choanoflagellida
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3 3 Endosymbiosis • Theory of endosymbiosis proposes that mitochondria originated as symbiotic, aerobic bacteria. – Each mitochondrion has its own genome in a circular, closed molecule of DNA. • divide by simple fission – directed by nuclear genes
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4 4 Theory of Endosymbiosis
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5 5 Classifying Protists • Protists are the most diverse of the four kingdoms in the domain Eukarya. – artificial group of convenience • single-celled organisms – little consensus about classification
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6 6 Protist Classification
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7 7 General Biology of the Protists Cell surface – possess varied array of cell surfaces Locomotor organelles – chiefly flagellar rotation or pseudopodial movement Cyst formation – dormant form of a cell with resistant outer covering in which metabolism is essentially shut down
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8 8 General Biology of the Protists –Nutrition • employ all forms but chemoautotrophic –phototrophs –heterotrophs »phagotrophs - visible food particles »osmotrophs - food in soluble form
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9 9 General Biology of the Protists – Reproduction • typically reproduce asexually – binary fission - equal halves
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This note was uploaded on 08/03/2010 for the course BIO 1500 taught by Professor Pandolfi during the Spring '08 term at Wayne State University.

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chapter_28_pdf - Protists Chapter 28 1 Outline...

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