bioTest_3_notes_(chapter_33) - Chapter 33 Invertebrates...

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Chapter 33 – Invertebrates Characteristics of animals o Multi cellular eukaryotes o Heterotrophic o No cell wall o collagen (intracellular glue) o Intercellular junctions: tight junctions, desmosomes, gap junctions (holding and interactions between cells) o Nerve and muscle tissues (plants have interactions between cells that are similar to neurotransmitters) o Cytokines is (differ from plants) o Development (differ from plants) 1 st radiation: Ediacaran biota: multi cellular soft bodied eukaryotes that went extinct. None live today. 2 nd radiation (Cambrian explosion): multi cellular hard bodied eukaryotes whose descendants live today. All animals are multi cellular All animals are heterotrophic (use organic material from others). Homeotic genes are a category of regulatory genes. Points of agreement o All animals share a common ancestry (monophyletic) o sponges are the most primitive form of animals o All animals except for sponges have tissue-level differentiation
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This note was uploaded on 01/26/2012 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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bioTest_3_notes_(chapter_33) - Chapter 33 Invertebrates...

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