11 - BIO LECTURE NOTES Protists and green plants...

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BIO LECTURE NOTES (1/30/09) Protists and green plants Multicellurarity o In some lineages for protists, the key morphological innovation was multicellularity Specialized cells for obtaining food or reproduction Key point is that there is differentiation among cells in gene expression . Cellular specialization o Multicelluarity evolved several times as protists diversified Major innovations of eukaryotes o Multicelluarity o Mitochondrion o Cellular structures for support and protection o Nuclear envelope o Ingestion of food o Sexual reproduction How do protists find food? o 1) ingesting packets of food o 2) absorbing organic molecules directly from the environment o 3) performing photosynthesis How do protists move? o Many protists actively move to find food A) amoeboid motion via pseudopodia B) swimming via flagella C) swimming via cilia How do protists reproduce?
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