BIOL 121 Lecture Notes - Lecture 2: Asexual Reproduction, Bifidobacterium, Anabaena
Document Summary
Characteristics of life: consist of one or more cells cell theory all forms of life can be divided based on their cellular structure, unicellular (all functions performed) vs. multicellular (some cells have specialized functions) Protists are neither animals, plants or fungi (brown algae)not all unicellular organisms are bacteria protists (unicellular algae, protozoa: life requires constant input o energy and raw materials. A) autotrophs: synthesize their own food (self feeders)o use an external energy source to produce organic matter form inorganic raw material. Photoautotrophs: use light t from sun (energy) and inorganic materials (h2o and co2) (cyanobacteria- anabaena)) Chemoautotrophs: use inorganic compounds (h gas, s, nh3, nitrites, fe) as energy sources (sulphur bacteria: heterotrophs: require preformed organic molecules; use energy in organic matter obtained (eaten) from other organisms. Photoheterotrophs: use light from sung to generate atp, but need to take in organic compounds rom their environment (dead sea bacterium- halobacterium)
