Bio 250 straighterline test 1 prep Questions with 100% Verified Answers

Bio 250 straighterline test 1 prep Questions with 100% Verified Answers A classification system based on mutual similarity that involves comparing as many characteristics as possible is called a __________ system. Select one: a. phylogenetic b. phyletic c. phenetic d. determinative systematic - c. phenetic A diagram of the three domains (Bacteria, Archaea, Eukarya) proceeding from the Last Universal Common Ancestor would show Archaea Select one: a. as the original cells from which the others derived. b. branching off the Domain Eukarya. c. branching off the Domain Bacteria - b. branching off the Domain Eukarya. A diagram of the three domains (Bacteria, Archaea, Eukarya) proceeding from the Last Universal Common Ancestor would show Archaea Select one: a. as the original cells from which the others derived. b. branching off the Domain Eukarya. c. branching off the Domain Bacteria. - branching off the Domain Eukarya. A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation? Select one: a. The microbiologist used too much inoculum. b. The culture was contaminated. c. The incubation temperature was incorrect. d. The culture medium was selective. e. The culture medium was differential. - b. The culture was contaminated. A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation? Select one: a. The microbiologist used too much inoculum. b. The culture was contaminated. c. The incubation temperature was incorrect. d. The culture medium was selective. e. The culture medium was differential. - The culture was contaminated. A microbiologist must culture a patient's feces for intestinal pathogens. Which of the following components would likely be present in a selective medium for this purpose? Select one: a. NaCl b. Sheep red blood cells c. Bile salts d. Thioglycolic acid e. Peptone - c. Bile salts A microscope that exposes specimens to ultraviolet, violet, or blue light and forms an image with the light emitted at a different wavelength is called a __________ microscope. Select one: a. phase-contrast b. dark-field c. scanning electron d. fluorescence - d. fluorescence A new microbe has been discovered in the rumen of sheep. Microscopy shows no evidence of a nuclear membrane and biochemical studies of the cell wall demonstrate the lack of peptidoglycan. Metabolic studies show that this microbe generates methane. This microbe would most likely be classified in the: Select one: a. Domain Bacteria b. Domain Archaea c. Domain Eukarya, Kingdom Fungi d. Domain Eukarya, Protists - b. Domain Archaea A nutrient medium that contains at least one ingredient that is not chemically dened is termed ______. Select one: a. complex b. reducing c. enriched d. synthetic - a. complex A nutrient medium that contains at least one ingredient that is not chemically defined is termed a. complex b. reducing c. enriched d. synthetic - a. complex A nutrient medium that contains at least one ingredient that is not chemically defined is termed ______. Select one: a. complex b. reducing c. enriched d. synthetic - A nutrient medium that contains at least one ingredient that is not chemically defined is termed ______. Select one: a. complex b. reducing c. enriched d. synthetic - complex A nutrient medium that has all of its chemical components identified and their precise concentrations known and reproducible is termed ______. Select one: a. complex b. reducing c. enriched d. defined - d. defined A pure culture contains Select one: a. only one identified species of microorganism. b. only bacteria. c. microbes from a single source. d. a variety of species from the same genus. - only one identified species of microorganism. A scanning confocal microscope Select one: a. uses ultraviolet light to form a specimen image. b. scans narrow planes and can build a three-dimensional image of the specimen. c. produces specimen images on electron micrographs. d. uses dyes that emit visible light when excited by ultraviolet radiation. - b. scans narrow planes and can build a three-dimensional image of the specimen. A scientist who studies the influence of microbes in the formation of caves is called a(n) ______. Select one: a. geomicrobiologist b. astrobiologist c. epidemiologist d. immunologist - a. geomicrobiologist