Microbiology Final Straighterline Exam Study Questions with Correct Answers

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 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