Biology 2217B Lecture Notes - Lecture 12: Dinoflagellate, Brown Algae, Red Algae
13 Jul 2019
School
Department
Course
Professor
Document Summary
Characteristics of the algae: photosynthetic, chlorophyll-a as the major light-absorbing pigment, have a cell wall, body thallus, can vary from a microscopic unicellular organism to a large, macroscopic and multicellular. Cyanobacteria: or blue-green algae, prokaryotic cells, primitive organisms, first appeared in the fossil record approximately 3. 5 bya, widely distributed and can be found in oceans, fresh water, and damp terrestrial habitats. Euglenoids: division euglenophyta, have a proteinaceous covering called a pellicle that allows for flexibility and shape change. Freshwater unicells that are typically grass-green in color during swimming: also have a large red eye spot involved in sensing the direction of light, distinctive feature, reproduction is by binary fission. Life cycles are especially complex three stages, two diploid phases and one haploid phase: absence of any flagellated cells must depend on water movements for fertilization and spore dispersal. Life cycles are especially diverse: some reproduce asexually my means of zoospores, flagellated spores, sexual reproduction may be isogamous, anisogamous, or oogamous.
