BMSC 210 Midterm 1 Questions | 100% Correct Answers | Verified | Latest 2024 Version

BMSC 210 Midterm 1 Questions | 100% Correct Answers | Verified | Latest 2024 Version The person who described the "wee animalcules" was? - Antoni van Leeuwenhoek In what/which domain(s) of life is/are microorganisms represented? - Archaea, Bacteria, Eukarya Which of the following statements is correct? A. Microorganisms represent a much smaller amount of Earth's biomass than animals B. Microorganisms are significant in number, but not in overall biomass C. Microorganisms represent a much smaller amount of Earth's biomass than plants D. Microorganisms are significant contributors to the total biomass on Earth - D Robert Koch contributed to the field of microbiology by being the first person to... A. develop the tuberculin test only B. use agar as a solidifying agent in growth media only. C. develop the tuberculin test, formulate four postulates for definitively linking a specific microorganism to a specific disease, and use agar as a solidifying agent in growth media. D. formulate four postulates for definitively linking a specific microorganism to a specific disease only - C Regarding early life on Earth, which statement is true? A. Microbial life, plant life, and animal life all appeared at about the same time B. It is impossible to determine which type of life first appeared. C. Microbial life existed long before animals but has been around for about the same amount of time as plants. D. Microbial life existed for billions of years before plant and animal life. - D Electron microscopy has greater ________ than light microscopy, because the wavelength of visible light is much larger than the wavelength of electrons. A. Resolution B. Penetration C. Magnification D. Contrast - A You have discovered a new microorganism and would like to classify it as a eukaryote or a prokaryote. To investigate this question, you prepare a slide with a simple stain and view it with a light microscope with a 40X objective lens and 10X ocular lens. You also prepare a control slide using Saccharomyces cerevisiae (a unicellular eukaryote). You can see the cells on your control slide, but you don't see cells when you look at your unknown microorganism. What can you conclude from this experiment? A. The experiment failed to visualize the organism because the stain killed it. B. The new unknown microorganism is probably an archaeon. C. The cells of the new unknown microorganism may be too small to see with the objective and ocular lenses you used. D. Your new unknown microorganism is probably a virus - C The use of the Gram stain in microbiology is important because it differentiates A. bacterial cells with different types of cell walls. B. Bacteria from Archaea. C. archaeal cells with different types of metabolism. D. prokaryotic from eukaryotic cells - A Viewing the shape of a bacterial or archaeal cell using a microscope gives a great deal of information about the metabolism and lifestyle of the organism. (True or False) - False A bacterial cell is interpreted as gram-positive when it forms purple insoluble crystal violet-iodine complexes within the cell during the Gram stain. (True or False) - True Based on your knowledge of porins, what is the best description of the specific type of porin called an aquaporin? A. Cations bound to water molecules B. Enzymes involved in the generation of water within cells C. Molecules that prevent water from crossing a membrane D. Water transport proteins - D Which is the only group of microorganisms that contains lipopolysaccharides (LPS)? - Gram-negative bacteria Both hydrophilic and charged molecules