Microbiology Final Straighterline Exam Study Questions with Correct Answers The study of evolutionary relationships among organisms is called ______. - Correct Answers phylogeny The three cell types discussed, eukaryotes, archaea, and bacteria, all derived from ______. - Correct Answers Last Universal Common Ancestor Organisms called parasites are ______. - Correct Answers always harmful to their host Which of the following does not indicate microbe involvement in energy and nutrient flow? - Correct Answers Thermal hot springs warmed by heat from earth's interior The subatomic particles that surround the nucleus are the ______. - Correct Answers Electrons The number one worldwide infectious diseases are ______. - Correct Answers respiratory disease A fat is called _____ if all carbons of the fatty acid chain are single-bonded to 2 other carbons and 2 hydrogens. - Correct Answers saturated 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? - Correct Answers lipid 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? - Correct Answers 95X 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? - Correct Answers cell size of 0.5 to 2 microns Which type of microscope achieves the greatest resolution and highest magnification? - Correct Answers electron 1 / 2
Which of the following is produced by adding 1% to 5% agar to nutrient broth that is then boiled and cooled? - Correct Answers a solid medium a spongiform encephalopathy of humans - Correct Answers Creutzfeldt-Jacob disease The term that refers to flagella at both poles of the cell is ______. - Correct Answers amphitrichous 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? - Correct Answers saprobe During the Gram stain, the application of alcohol results in the decolorization of ______ cells. - Correct Answers gram-negative The size of a eukaryotic ribosome is ______ - Correct Answers 80s Sterilizing filters have a pore size of 0.22 μm. Which of the following statements is true? - Correct Answers 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.One of the principal viral capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a/an _____ capsid. - Correct Answers icosahedral Amoebic dysentery is most commonly contracted through - Correct Answers fecal oral the viral genome inserting into bacterial host chromosome - Correct Answers lysogeny Which of the following is not associated with every virus? - Correct Answers envelope When bacilli in a chain fold back upon each other like a hinge, this cellular arrangement is termed a ______. - Correct Answers palisade proteins associated with DNA in the nucleus. - Correct Answers histones
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