BIO 105 Lecture Notes - Lecture 30: Toothpaste, Protist, Paramecium
Document Summary
Typically unicellular and have complex organization within the cells. Phylogenetic relationships are often unclear because of the complexity. Fungi-like (but not because of cell wall differences protists- cellulose, fungi- chitin) More structural and functional diversity than with any other group of eukaryotes. High amount of variation in environments where found e. g. oceans, mountain peaks, soils, ponds, etc. Costs: find a mate (time, energy), choosing a mate, disease spread. If benefits > cost, sexual reproduction will evolve. Algae secondary symbiosis chloroplasts in photosynthetic eukaryotes e. g. green algae are engulfed by a heterotrophic eukaryote giving rise to diversity. Specialized shape is able to penetrate host cells. Most have life cycles with both asexual and sexual stages (within the one life cycle) e. g. plasmodium that causes malaria. 10% of world population gets infected with malaria: pesticides (e. g. ddt control mosquito population) Mosquitos of resistant strains survive, reproduce, increase fitness: gmo mosquito. Resistant to plasmodium plasmodium cannot move to salivary glands.
