BIOL 103 Lecture Notes - Lecture 1: Protozoa, Gastrointestinal Tract, Zymogen
Document Summary
Two major categories of organisms based on their mode of obtaining nutrients: autotrophs (gk = self-nutrition) These organisms harvest light or chemical energy and store it in carbon compounds. They can exist in an organic environment and they manufacture organic compounds. For instance: co2 + h2o - organic compounds such as c6h12o6. These organisms must get complex nutrients from the environment. This is the process that we call digestion. Heterotrophs have evolved multiple strategies for obtaining food to absorb nutrients so yes they can be parasites. Bread mold is an example of extracellular digestion. Athlete"s foot fungus extends fungal branches (cid:523)=hyphae(cid:524) into the cells of the foot hold nematode worms. They hyphae then penetrate the worm"s body, digestive. Ex, dactylella dreschsleri is a fungus that has sticky knobs along the hyphae that can enzymes are released and extracellular digestion takes place. It is a fungus that makes traps that are used to capture nematode worms.
