BIO SCI 94 Lecture Notes - Lecture 10: Programmed Cell Death, Cambrian Explosion, Symmetry In Biology

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

The beginning of the animals: a group of multicellular eukaryotes that differ from their protist ancestors in numerous ways. All of the animal phyla appeared during the cambrian explosion. Lineages within those phyla have since diversified greatly. Timing of first land animals is argued about. Fungi and animals are both heterotrophs, but unlike fungi, animals usually ingest their food before they digest it. Fungi cells have cell walls, animal cells do not. Many fungi are multicellular, but their cells are not held together by an extracellular matrix (ecm) composed of proteins and polysaccharides, as is the case with animals. Fungi never move under their own power. Animalia: a major lineage of eukaryotes that typically: Are mobile, under their own power, at some point in their life cycle. And (except for sponges), have neurons and muscle cells. The developmental tool kit is thought to have been present in the ancestor of the animals.