BIOL 202 Study Guide - Midterm Guide: Asexual Reproduction, Vacuole, Scleroprotein

• School: Queen's University
• Department: Biology
• Course: BIOL 202
• Professor: Laurene M Ratcliffe

Document Summary

Supported by skeleton that may consist of microscopic needlelike spikes called spicules: formed by amoeboid cells, made of calcium carbonate or silica, fibrous protein made of collagen. Alternatively skeleton may be made of sponging. Do not have nerve cells to coordinate body functions. Most reactions result from individual cells responding to stimulus. Other reactions do suggest some communication among cells. Diffusion: large volumes of water filtered so nitrogenous waste (principally ammonia) and gas exchange occurs by diffusion) Suspension feeder (a few sponges are carnivorous deep-water, can capture. Intracellular digestion: occurs within vacuole by lysosomal enzymes and ph changes, partially digested food is passed to amoeboid cells which distribute it to other cells.