Lecture 13 - animal diveristy0

Lecture 13 - animal diveristy0 - Lecture 13 Animal...

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Lecture 13 – Animal Diversity 1. What are animals A. Derived traits 1. Multicellular Ingesting heterotrophs (compared to plants and fungi) 2. Unique tissues (e.g. muscle and nervous) 2. Lack cell walls (structural support provided by extracellular proteins) 3. Intercellular junctions 6.32 a. Tight junctions – protein binding of neighboring plasma membranes; water Tight b. Desmosomes – (anchoring junctions) – strong rivet like proteins that connect Tissues into strong sheets (e.g. muscles) anchors cells to one another c. Gap junctions (communicating junctions) provides a pore through which Cellular products can be exchanged (important in heart beating) , allows material to flow back and forth between cells -collagen provides rigidity to animal cells -corals and sponges are animals II. Evolutionary History of animals 32.3 A. Choanoflagellates are closest protist relative of animals 1. Evidence a. Near identical morphology with sponge collar cells b. Collar cells found only in animals and choanoflagellates (no other protists) c. DNA sequence similarity B. Late proterozoic era
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Lecture 13 - animal diveristy0 - Lecture 13 Animal...

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