PROTOZOA - PROTOZOA

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PROTOZOA This group consists of unicellular, eukaryotic organisms belonging to the kingdom Protista. They  live in water and soil, and all are chemoheterotrophs. The vegetative stage is known as a  trophozoite. Only a few of the 20,000 species cause disease, and some are considered part of the  normal inhabitants of other animals.  CHARACTERISTICS 1. Life cycle—protozoa reproduce asexually by fission, budding, or schizogony (multiple  fission). In this process the nucleus undergoes multiple divisions before the cell divides into  numerous daughter cells, including a little of the cytoplasm in each.  Some protozoa also reproduce sexually. The ciliates such as  Paramecium  undergo a process  called conjugation. Two cells fuse, and a haploid nucleus from each cell migrates to the other  cell, thus exchanging genetic material. Some protozoa produce gametes (haploid sex cells) which 
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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