microbiology final straighterline questions & answers verified 2023

microbiology final straighterline questions & answers verified 2023phylogeny The study of evolutionary relationships among organisms is called ______. Last Universal Common Ancestor The three cell types discussed, eukaryotes, archaea, and bacteria, all derived from ______. always harmful to their host Organisms called parasites are ______. Thermal hot springs warmed by heat from earth's interior Which of the following does not indicate microbe involvement in energy and nutrient flow? Electrons The subatomic particles that surround the nucleus are the ______. respiratory disease The number one worldwide infectious diseases are ______. saturated A fat is called _____ if all carbons of the fatty acid chain are single-bonded to 2 other carbons and 2 hydrogens. lipid One technique for staining bacteria for viewing under the microscope is called the Gram stain. In this technique, alcohol is used as a decolorizer because it degrades the outer membrane found in some bacteria. What chemical component of the cell does alcohol affect? 95X If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X? cell size of 0.5 to 2 microns NASA has published a list of criteria for identifying fossil bacteria in samples from Mars, as part of a search for evidence of life. Which of the following is good evidence for the presence of bacterial cells? electron Which type of microscope achieves the greatest resolution and highest magnification? a solid medium Which of the following is produced by adding 1% to 5% agar to nutrient broth that is then boiled and cooled? Creutzfeldt-Jacob disease a spongiform encephalopathy of humans amphitrichous The term that refers to flagella at both poles of the cell is ______. saprobe In the condition called athlete's foot, the fungus Trichophyton consumes the keratin protein found in hair, nails, and dead skin. Which of the following descriptors does not apply to Trichophyton? gram-negative During the Gram stain, the application of alcohol results in the decolorization of ______ cells. 80s The size of a eukaryotic ribosome is ______ Bacterial cells are typically between 1-10 μm and are blocked by the filter, whereas most viruses are between 20 and 200 nm and therefore pass through. Sterilizing filters have a pore size of 0.22 μm. Which of the following statements is true? icosahedral One of the principal viral capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a/an _____ capsid. fecal oral Amoebic dysentery is most commonly contracted through lysogeny the viral genome inserting into bacterial host chromosome envelope Which of the following is not associated with every virus?