BIOL 2051 : Exam 1 Structure And Function
Document Summary
Impact of microbes: disease, at the start of the 20th century, pathogens were the major causes of death in humans. Infectious diseases caused by microorganisms: much less deadly today. Increased understanding of infectious diseases caused control of the diseases: microbial diseases still a problem in developing countries, ex. Malaria, tuberculosis, cholera, african sleeping sickness, measles, pneumonia: humans worldwide under threat from suddenly emerging diseases, ex. Most microbials cause no harm but instead are beneficial: agriculture, benefits from the cycling of nutrients by microorganisms, ex. Legumes and root nodules: bacteria on roots convert atmospheric nitrogen into ammonia, useable by the legumes, causes no need for fertilizer, microorganisms reside in rumen of cattle and sheep. Special digestive vessel: where microorganisms digest and ferment cellulose at neutral ph, cattle could not digest w/o them. Food: microbial diseases of plants and animals used for human consumption, can cause economic loss. Food product can cause human disease: ex.
