BSC 2011 Lecture Notes - Lecture 1: Proteoglycan, Synapomorphy, Protist

• School: University of Florida
• Department: Biology - Biological Sciences
• Course: BSC 2011
• Professor: Jennie Demarco

Document Summary

General characteristics of animals: multicellularity, heterotrophy. Eat autotrophs: internal digestion, motility-can move. All animals have a common ancestor (monophyletic: synapomorphies, unique junctions between cells. Tight junctions-proteins directly connect the membranes of two adjacent epithelial cells and prevent movement of extracellular material or membrane components past junction. Desmosomes-tightly links adjacent cells but allows movement of materials in the intercellular space. Gap junctions-hydrophilic protein channels that permit communication between two adjacent cells. Distinct layers of cells form in early development. Tuesday, june 7, 2016: diploblastic-two cell layers. Mesoderm (between outer and inner: gastrulation-embryo is a hollow ball of cells that indents to form a cavity, the blastopore, triploblastic animals (bilaterians) are divided into: Protostomes mouth rst : blastopore develops into the mouth. Deuterostomes mouth second : blastopore develops into the anus; mouth develops later, body plan. General structure, arrangement of organ systems, and integrated functioning of body parts. 4 key features: symmetry (overall shape) Radial symmetry-body parts arranged around a central axis.