BIOL 112 Lecture Notes - Lecture 32: Archenteron, Protostome, Eumetazoa
21 Nov 2016
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Document Summary
Animals - multicellular, heterotrophic, eukaryotes: nutritional mode. Use enzymes to digest within body, unlike fungi which absorb digested food: cell structure and specialization. Animals lack the structural support of cell walls. Collagen - protein to provide structural support to cell membrane (one of many) Groups of similar cells that act as a functional unit. Ability to move and conduct nerve impulses underlies many of the adaptations that differentiate animals from plants and fungi. Lack muscle and nerve cells: reproduction and development. Haploid - egg and sperm are produced by meiotic division. Non-motile egg + flagellated sperm = diploid zygote. Cleavage: mitotic division without cell growth between divisions. Gastrulation: layers of embryonic tissues that will develop into adult body parts. Larva - sexually immature form of an animal. Metamorphosis - developmental transformation that turns the animal into a juvenile that resembles an adult but is not sexually mature. Genes that control animal development are similar for a lot of taxa.
