Inquizitive Exam 1 (A+ GRADED)

most accurate and common definition of a microbe correct answers an organism that can't be seen by the unaided human eye Which of the following are helpful roles played by microbes in human health and ecology? correct answers geochemical primary producers in marine environments ground water purifiers In the eighteenth century, it was observed that milkmaids were less likely to contract smallpox than others. What caused this trend amongst milkmaids? correct answers exposure to cowpox Place Koch's postulates into the order used to determine what microbe is responsible for causing a specific disease. correct answers 1. the microbe is found in all cases of the disease but is absent from healthy individuals 2. microbe is isolated from diseased host and grown in pure culture 3. when microbe is introduced to healthy susceptible host, the same disease occurs 4. the same strain of microbe is obtained from newly diseased host Which of the following best describes the germ theory of disease? correct answers specific diseases are caused by specific microbes What term refers to microbes that live within and provide essential functions to multicellular organisms? correct answers endosymbiont microbes dependent on growing on top of stone correct answers lithotrophs the following is true of PCR (polymerase chain reaction) correct answers it uses an enzyme isolated from microbes that live at high temps it is a lab technique used to amplify DNA What difficulties arise when trying to rigorously apply Koch's postulates to show that HIV causes AIDS? correct answers HIV cant be grown in a pure culture it is unethical to knowingly introduce the virus to a healthy host Which of the following is true of nitrogen fixation? correct answers certain microbes can fix nitrogen it is the conversion of nitrogen gas into ammonia Although some microbes are pathogens, humans also harness microbes to enhance human health. Which of the following are ways microbes are used in health care? correct answers weakened forms of microbes= vaccines microbes are screened as new sources of antibiotics gene therapy