NATS 1670 Lecture Notes - Lecture 21: Bubonic Plague, Vitamin K, Lung

• School: York University
• Department: Natural Science
• Course: NATS 1670
• Professor: Motti Anafi

Document Summary

99 % of microbes are not dangerous, but are actually healthy and can provide protection (trillions of microbes) (life originated with microbes, and all forms of life are derived from microbes. ) Microbes can form 1 of 3 symbiotic (means to live together) relationships with their hosts - mutualistic, commensal, and parasitic. In mutualism both organisms benefit from the interaction ie. humans and intestinal bacteria, humans lack nutrients which are provided by the bacteria living in the intestine. Commensal relationships are one-sided; one organism benefits the other does not ie. a spider builds a web on a plant and receives shelter but does not harm the plant. In a parasitic relationship one organism benefits and the other is harmed or destroyed ie. -tuberculosis bacteria living in human lungs live and multiply while harming or destroying the human. This course will focus on the 0. 1 % of microbes that are parasitic and can pose a threat to our lives (disease-causing agents)