BI256 Study Guide - Final Guide: Zygote, Strobilation, Calcareous Sponge
Document Summary
Capable of performing locomotion, food capture, ingestion, digestion, egestion, respiration, excretion, osmoregulation, and reproduction. Two animal-like properties: (1) absence of a cell wall (2) presence of one motile stage in life. Locomotion by pseudopodia (false foot) or by protoplasmic flow without discrete pseudopodia. Most are free-living but there are also free-living types. Mainly fresh-water and parasitic naked amoeba, typically uninucleate. Commonly found in organic debris in fresh-water ponds and slow-moving streams where it ingests other protozoa, bacteria, and diatoms. Plant-like flagellates, pigmented chloroplasts used in photosynthesis (holophytic) 1. pellicle, thin, semi-rigid convering: reservoir-clear, flask-shpaed space at anterior end. Many live in hypotonic medium (lower concentration of salts and other molecules than their cytoplasm). Protozoan dispose of this water by a special water balance system, the contractile vacuole and its auxilary canals and vesicles. Expel it to the exterior via a small permanent pore. Conjugation takes place, encystment occurs under adverse conditions. Contraction is brought about by the contraction of the myoneme.
