BIOA01H3 Lecture Notes - Lecture 7: Amoeboid Movement, Contractile Vacuole, Naegleria

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Maydianne Andrade

Document Summary

Anything that is not fungi, animal, plant or prokaryote. Endosymbiosis led to rise of mitochondria and chloroplast. Diversity: habitat: aquatic or moist environments, structure: most are unicellular, oceans, freshwater lakes, ponds, streams, moist soil and within host organisms, some live as undifferentiated colonies. Cell-cell signalling is used to mediate cooperation: unique intracellular structures: Contractile vacuole: pumps water to prevent lysis in freshwater. Pellicle: layer of supportive protein fibers under plasma membrane. Pseudopodia: lobes of cytoplasm allow amoeboid movement: metabolism: aerobic, heterotrophic. Diffusion: photoautotrophic, amoeboid motion via pseudopodia, swimming via cilia, swimming via flagella, reproduction: sexual or asexual. Excavates: flagellated, single cells, lack mitochondria, adapted to parasitism, low oxygen, 2 forms. Enters via the nose and crosses the blood-brain barrier. Results in hearing loss, confusion, loss of voluntary control, respiratory failure. 3 forms:o amoeboid: cyst (unfavourable conditions: desiccation, cold, crowding, flagellate (change in ionic concentration) Aggregated amoebas form a slug that crowds in coordinated fashion.