hich of the following factors is a unique event in the evolution of the niche of microbes? A. Variable surrounding conditions B. High mutation rates C. Transfer of DNA D. Selection among microbial p
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Which of the following factors is a unique event in the evolution of the niche of microbes?
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- which of the following definitions is not technically correct? a. broad spectrum - effective against many different types of microbes b. bacteriostatic - prevents microbes from growing c. antibiotic - microbial or synthetic product that kills or inhibits growth of microbes. d. all of the above are correctChoose the combination of answers that most accurately completes the statement. For mutations to have an effect on populations of microbes, they must be a. inheritable d. a and b b. permanent e. all of these c. benefi cialWhich of the following is not part of Koch’s Postulates? a. A specific microorganism must be present in a disease b. The organism must be isolated into pure culture c. Living organisms spring forth from non-living materials d. All of the choices are part of Koch’s Postulates
- Which of the following is not one of the six major elements microbes need tosurvive, grow, and reproduce?a. oxygenb. calciumc. sulfurd. nitrogene. carbonIn patients with nonresistant strains of the tuberculosis bacterium, antibiotics can relieve symptoms in a few weeks. However, it takes much longer to halt the infection, and patients may discontinue treatment while bacteria are still present. Explain how this could result in the evolution of drug-resistant pathogens.A bacterium has received new DNA that allows it to produce a toxin. Which of the following statements is true? A. There is a change in both the genotype and phenotype. B. There is a change in the genotype, not the phenotype. C. There is a change in the phenotype, not the genotype. D. There is no change in either the genotype or the phenotype.
- Match the following questions about the people who shaped the field of Microbiology to the "BEST" possible answer... A. Used lenses to make drawings of eukaryotes B. His early work laid the foundation for the study of plant diseases C. Discovered that organisms can derive energy from several different inorganic compounds D. Conducted later experiments to refute spontaneous generation E. Carried out early widespread vaccinations F. His bacterial grouping system laid the foundation for taxonomy based on genetics G. Published early accounts of sexual transmitted diseases H. Used lenses to make drawings of prokaryotes I. Conducted early experiments to refute spontaneous generation J. His bacterial grouping system laid the foundation for taxonomy based on morphologyThis bacterium derives nutrition by digesting human intestinal contents (in other words, food). Humans lacking this bacterium have no measurable reproductive advantage or disadvantage relative to humans who harbor this bacterium. Consequently, the bacterium can be properly described as which of the following? 1. symbiont 2. endosymbiont 3. mutualist 4. commensal Select one: A. 4 only B. 1 and 4 С. 1 and 2 A D. 2 and 4 E. 2 and 3What is the relationship between normal flora Escherichia coli (E. coli) and STEC? A When normal flora E.coli divide in two, they sometimes turn into STEC. B Everyone is colonized by STEC but only some people have non-STEC microbes in the large intestine. C Normal flora E.coli do not make Shiga toxin, but STEC are E. coli that do make Shiga toxin.
- Which of these statements is true? a. An antibiotic is any substance produced by a organism that is antagonistic to the growth of prokaryotes. b. An antibiotic is any substance produced by a prokaryote that is antagonistic to the growth of other viruses. c. An antibiotic is any substance produced by a prokaryote that is antagonistic to the growth of eukaryotic cells. d. An antibiotic is any substance produced by a prokaryote that prevents growth of the same prokaryote.which of the following is not a way that normal microbial prevent growth of competing microbes? a. production of substances harmful to competitors b. more efficient utilization of nutrients c. changing pH of environment d. all of the above are used by normal microbiota against competitors e. none of the above are utilized by normal microbiotaRecently, a microbe that is able to digest cellulose was discovered in a hot spring with an average temperature of 95°C. This microbe most likely belongs to which of the following groups? A. Archaea B. Proteobacteria C. Cyanobacteria D. Spirochetes